He has more than a chance - in fact, I think he'll beat Fury. You really never know in boxing between good fighters, but Usyk is a once in a life time talent, and as I've said, the size difference doesn't look as big when you look at them together. That pendulum stance and footwork Usyk adopts is a problem. Cruiserweights didn't have the speed or skill to nullify it, so not sure how any heavyweight will deal with him. His engine is insane so he can keep it up through a fight.
He's also had good experience now in the Heavyweight scene. Again, can't be 100% on these things but I actually think Usyk will pull of a dominant win.