Hi, Mike. A friend asked me to respond to your posting, but this will have to be a partial response because there are some things I don't know about your particular surgery. Specifically, I never heard of a superpubic tube. Something like a stoma in your abdomen that you can peer into, collect urine from, comes with a cap? Never heard of it. Glad it's leaving you in a week.
So you have a neobladder, and I'm assuming you got a urethral reconnect and will hereafter pee through the same gadjet you always have. Me too; Kock pouch, done at USC/Norris Cancer Hospital in 1998.
My story is in Tales from the Trenches. I'm Bill K. Look at it because in answering you here I'll refer to some things in that Tale.
Urine control comes gradually, seemingly slowly, but it comes. You'll be able to speed it along with Kegel exercises, but in that connection read the horror story in my Tale about strengthening the pelvic floor muscles so much that the excessively stretched neobladder perforates and it's either quick emergency surgery or a painful death from peritonitis. Your surgeon gave you a "shouldn't exceed, maximum volume" number and you can test it by peeing into a measured bottle.
My Tale also has a description of my ingenious nighttime continence pad made from a #1 size baby diaper. I still need it at night, even with a timer-beeper set to wake me every couple of hours. It won't be long before you'll need nothing at all in the daytime.
You know by now that the intestine is muscous-producing tissue, and you'll blurp a little out every time you go.
Yes, you have to push, sort of like for a bowel movement, a pressing inward with the abs. Without pushing the stream will indeed be weak.
And yes, you'll be saying "close to normal" about your life with your neobladder. Without that muscle wall that's around the old fashioned bladder, you'll never have a "gotta pee" feeling, maybe just a slight ache or a little squirt if it's getting stretched too much. You gotta be a clock watcher instead.
My Tale also has some vitamin/supplement suggestions, said to ward off recurrences. All I know about their efficacy is that I feel good and haven't died. Mike, I hope you have a fine recovery and a long life.