XSUPREMEXSKILLZ
The Immortal Emperor
Zen-Oh in the anime erased Cosmic Zamasu, who had embodied time and space throughout the entire Trunks timeline, and was even beginning to affect the alternate present timeline. Zen-Oh erased him and all the universes in the timeline, along with presumably his realm that exists on a higher plane of existence than the 12 universes.
In the manga, it's even better, as Zen-Oh erases hundreds of Merged Zamasu's (each one being so much more powerful than regular SSJB Goku that, when suppressed, they feel as if Goku isn't even moving,) and the entire timeline, to the extent that the time ring is erased (implying that absolutely everything was indeed destroyed). I see no reason why this wouldn't include the world of void, Zen-Oh's realm, alternate dimensions, etc. Zen-Oh does all this instantly and effortlessly.
Verdict: I'm willing to bet Zen-Oh has infinite 3D erasure capabilities. Hell, even someone as comparatively weak as Jiren has power that can reach infinity according to both Android 18 and Elder Kai, and can block a far more powerful SSJG Goku's punches with a finger, whilst suppressed heavily. Hell, it's entirely possible that Zen-Oh even has limitless, or at least nigh-limitless, 4D destructive capability as well.
I don't know who I'd put him on the level of in Marvel or DC. Dimensional tiering doesn't tend to really work with comics. That said, I think Zen-Oh is definitely above universal (not Multiversal) abstracts like Eternity and Infinity, but below the Infinity Gauntlet. I can be convinced otherwise, though.