Whenever I had a male pet neutered, I pretty much let them go about "life as usual". It's much less of a procedure than when a female is spayed, so if the boy feels good, he must not be in much/if any pain. It's a lot more difficult to keep a cat quiet for a week, than it is a dog. I wouldn't worry too much about it.

Patches - be a good boy and quit worrying your Mom! It won't hurt to rest and relax, you know!