Anytime my buns have gone in for surgery (teeth & a spay), I needed to supply bunny pellets. I also left several raisins for after surgery feeding treats. The vet told me that they like bunnies to eat right up to surgery and start eating asap post surgery. The reason other pets need to fast is b/c they can aspirate vomit into their lungs. Fortunately or Unfortunately, depending on how your look at it, bunnies can’t/don’t vomit.
When Jess required stitches post a bunny battle, the vet gave me silvedine cream and some kinda of soak meds. This was to help keep her wounds clean and non-itchy, so she wouldn’t be tempted to gnaw on her stitches or wounds. I’ve held on to that silvedine & have used it on surgical wounds for my cats and even Jessi post spay. So you could always ask about that.
I also suggest pre-surgical blood work. Its an option at my vet for any surgery (bunny or other species). However, they do occassionally recommend it, such as w/ older pets. I did the pre-surgical blood on both my cat b/f her teeth removal and Leo b/f his last rear molar filing. In both instances it was the best $50 I spent. Phoebe ended up being diabetic and that’s when we id’d that Leo may have liver concerns. I would recommend just in case. Good Luck!