Of course will he recognize you! Your are his home and he'll be very glad to see you again and snuggle more than ever.

With little boys, recovery is very easy after they've been fixed. Here it is not usual that they spend the night in the vet clinic, so mine had their surgery first thing in the morning, came back in the early afternoon (just after waking up) and were sleeping on the radiator until early evening.
I remember quite well little Filou, coming down, walking very shaky to the kitchen, having a huge bowl of food and then going to the highest level of the cat tree to have another extended nap -and that was it. In the night he cane to our bed and the next day he was his usual mischievous self!
(But he stopped singing operas in the night )