Welcome to the forum. No one can be sure with this disease, but with early stage localised cancer, he has a high chance of being cured.
I haven't had surgery so I can't give any precise tips. But in general, take it easy. If he is fit and active, just get him to slow down a little. It is major surgery, lots of muscle and tissue were cut. Yes a bit of exercise is good, but over doing things in the next six weeks could delay a good recovery by six months. If when the catheter comes out there is hardly any bladder control, don't worry, at all, it can take months to get full control back.
Some people are lucky, they have full bladder control straight away, and are doing long walks, and cycling within a few weeks. But we get a good few posts, a few weeks after surgery, where people say "I was doing fine, then I forgot all about the surgery and lifted a bag of coal and now I have a pain in my abdomen".
So tell him to take it easy. If after two weeks, he is still lying in bed, and rings a little bell and demands you bring him his favourite cigars, and a fine bottle of port, then know he is taking the piss.
I'm sure some others will post soon with more specific advice.