Possible but unlikely. There’s going to be some pretty significant behavioral differences between him and any great horned owls, especially if he’s been in a zoo his whole life. The behavioral differences will make it hard to find a mate. Released zoo animals are less likely to find a wild mate (and that’s not even considering that he’s a different species lol)

Also great horned owl breeding season started weeks ago so he’s gonna have to pick up the pace if he wants to find a mate. He’s already behind so he would need to find a territory, nesting site, and a willing mate in the next 2-3 weeks

Also great horned owls are semi-uncommon in the city so he’ll have pretty limited options. If he’s still in central park I think there is actually a single female there though