Beautiful kitty!

It's not uncommon for spays to spend the night, however there are some vets that send them home same day.

Either way it would probably be a good idea to have someone stay with your kitty until you get home. In case there are any problems with your kitty staying calmed down once home it would be best to have someone there until you know how your kitty will settle in.

Some vets use a cone, some don't because they believe the cone is more stressful to them unless there's a problem requiring one. Depends on the vet.

Good luck tomorrow and I'm sure your kitty will be fine and back to normal in no time.