He’s like my daughter use to be at that age. She use to fight sleep like she was fighting for her life. So today might be a late night for you. I wouldn’t be surprised but I assume you’re used to it.
I would bathe him at the same time as usual. I would also let him play a little longer or play with him to get his energy out. Just watch his behavior and you’ll notice when he will start acting tired/more cranky. Some babies his age will stay up till 10-11 if they wake up late from a nap. I can’t really predict tho because every baby is significantly different.