I don't like Thors and Hercs chances. Thor loses a major advantage by not having Mjolnir. He loses Mjolnirs hax and versatility and he loses a weapon that Doomsday shouldn't be able to pick up. And with Doomsday having a massive speed advantage, I could see him KOing Thor, before Thor can split him in half with Jarnbjorn.
I have never read a Hercules comic in my life, so I don't know what kind of a Hercules version Mortal Hercules even is and what he would do in this fight. Sounds weak though. And even if it's the regular God of Strength Hercules, who nearly choked out Thor... I don't see him being any kind of a factor against a much faster opponent.
All of that is in a battle board environment of course. If we judge the fight by how it would happen in the comics... Hercules grabs Doomsday and Thor splits him in half with Jarnborn.