The entire League gets schwacked in I'd say under 30 seconds. We all know how fast Metro Man is considering he spent hours in his time screwing around eating lunch, flying a kite, reading several books, etc... before coming back and setting up his death with a fake skeleton.
He was moving so fast the entire city was frozen in time, including kites in the air and food falling from a tray. Thousands of people at the very least were also absolutely still while he was in "Rainbow Mode". He even saw the orbital death ray which took 2, maybe 3 seconds for it to hit the observatory from space in slow motion. And only after the death ray was superheating the dome did he fly off to a nursing school, take the skeleton, put his cape on it, then come back and fake his death. He did all that in the span of a few seconds max if you combine both feats.
Also, Tighten who had Metro Man's powers but not his experience, was still strong enough to slice a skyscraper in two with by digging his fist into it and flying in a circle and rather easily fly around with the whole thing on his back before throwing it. The Empire State Building for example is 250,000 tons with nothing in it so it was insanely heavy, even just the portion he chopped off.
Metro Man is faster than Superman but it genuinely doesn't really matter. He's too weak to hurt him. He'd break his arm punching a Superman who was resisting. He wouldn't be able to beat idk Thanos or Thor for the same reason.
Also, bluntly, Metro Man's feat is not as impressive as people think. It is probably well below the speed of light. Still very fast but not as fast as some have claimed.
JL Superman was moving in relation to lightning (which moves at 1/3 the speed of light). So Metroman might be a little faster than Superman. After all Superman statued WW (who is a bullet timer).
Just know that bullets statue humans.
Metroman spent a whole afternoon doing shit and reflecting on his own life while the world was literally like a statue from his point of view, not even a second of time seemed to pass.
People downplaying his speed need to watch Megamind again.
Superman and flash were moving in relation to the lightning coming from the flash. Lightning moves at about 1/3 speed of light (many sources).
Let's assume that inside Clark's slowed down perception He throws a punch at Flash resembling 9m/s (approximately 20mph). But in reality, said punch moves at 1/4 speed of light. This means that 1/4 speed of light will appear to be 9m/s inside Superman's slowed down perception.
That would imply that an object moving at a real speed of 1m/s (all objects shown in the Metroman scene were moving no faster than that) will appear to be moving at 1.08e-6m/s inside same said slowed down perception. In turn, this would mean that for 1min inside said slowed down perception said object would will have moved less than 0.1mm. This is below human visual acuity and said object will appear to be completely frozen in time for that entire time.
Note: All objects in the Metroman scene had no more than a few seconds of screen time. So we can only speculate these seemingly frozen objects moved less than 0.1mm within 10 minutes inside Metroman's slowed down perception.
In conclusion, we can only speculate (not prove) whether or not Metroman was perceiving time any slower than Clark was.
Someone with Metroman powers were throwing skyscrapers across the city. Namek and Faoro, beings who doesn't have anywhere near the fts was hurting Clark.
Objects with speed of 1m/s or less that moved less than 0.1mm within 5 seconds of his perception means he was moving at a small fraction of light speed at the least.
I'll do a calculation later.
Here is a calculation of Metroman's minimum walking speed.
Fact1: 0.1mm is the limit of human visual acuity. That means it is impossible to tell, with the naked eye, a displacement of 0.1mm or less. In other words, an object that displaces a distance of 0.1mm or less would appear as it didn't move at all. Hence a statue.
Fact2: All objects in the Metroman scene were moving with a real speed of less than 1m/s.
Fact3: No object was shown more than 5 seconds of Metroman's perspective (screen time).
Now Let's find Metroman minimum speed.
Assume the fastest moving object in all the scenes with real speed of 1m/s that traveled 0.1mm during a total of 5 seconds it was shown on screen (Metroman's perspective). No object was shown with more than 5 seconds of screen time.
Normally the object will have moved 5m in 5 seconds. So 5m/0.1mm = 50,000 times scale factor. So everything Metroman does in human speed in this state can be multiplied by 50,000 to get his minimum speed.
For example, Assuming 3mph is average walking speed then Metroman was walking around at 3x50,000mph or 150,000 Mph.
Speed of sound is 767mph.
So 150,000/767 = Mach 196 is HIS MINIMUM walking SPEED.
Note : His maximum speed cannot be proven and is only speculation.
This is in fact worse than Aquaman pushing a submarine to the ocean's surface in seconds. It is much worse than the at minimum millions of tons of pressure on Superman's shoulders during the World Engine scene, or Superman being able to destroy the World Engine (which destroyed a nearby mountain upon arrival through its sheer bulk) by overpowering it and flying through it despite the fact that during both of these feats he was being weakened. And of course it is many many orders of magnitude below shifting a tectonic plate.
Metro Man has zero feats suggesting he could replicate any of this. He is so much weaker than Clark that he has zero hope of putting him down, especially since in full sunlight as seen in BvS he can heal from dying and deprived of sunlight to near full the moment the sun hits him.
Clark either wins or stalemate if Metro Man never lets Clark hit him.