aaah wishing them well and a fast recover.
When my does were spayed & buck neutered this is what I did...
Dog crate or small cage to make sure not to much excess hopping was done..especially no heights...for about 1 week.
Line cage with newspaper and then puppy pads ontop..as long as they are not chewers.
Fleece blanket one side for warmth, litter tray the other side and a cool area for them if needed.
Small lipped litter tray...not high sided - you dont want them catching themselves by mistake.
Hay stuffed into toilet rolls to stop any getting into their wounds if it were on the ground. Try keep base of cage relatively clean.
Bowl of water...easier & more natural way for bunny to drink from...especially when ill/recovering.
Bottle attached to side of cage as secondary option and I would know they had water if they wee'd in the bowl etc
Cover part of the cage for buns to feel safe, and nice darker area for them to sleep...
Favourite foods...to encourage eating...fresh foliage / foraged plants, fresh herbs...appple leaves/branches etc....and fresh hay.
Post-op Meds can be mashed into a small bit of banana....they gobble it up..or a favourite food....less stressful to medicate the buns.
Try assess bunnies wounds when they are sleeping on their sides...often their tummies will show & you can check for any problems..or if wound is healing well. Will be al ittle inflamed afterwards...but the redness should go down and there should be no seepage.
When I took mine in...I took each bunny their own fleece blanket that was NOT washed..it had all their own smells on and is a comfort for them after they have had their operation.
I also packed a lunchbox for them each...fresh / dried favourite foods and their own brand of pellets for them to be fed after the operation by the nurses. This really helped - the nurse told me - as they gobbled it up and it encouraged them to start eating hay etc.
The stitches should be dis-solvable...and you will go in for a post-op check a few days later.
The vet should keep bunny in until they have eaten, pooped & wee'd. if they have not yet wee'd ..then keep an eye on bunny until they have.
One of my does had to stay in for the night..but the other doe was fine....so I left them to stay in together..they were in cages next to each other..for comfort. All was fine...they just wanted to make sure the wound was ok on one doe.
hope this helps...this was just from my own experience
Hope it all goes well for you.