Cake help please

[Bunnybigears]

So I have made a cake and covered in chocolate buttercream. I need to add the fondant pigs (see pics) It will be for lunchtime tomorrow. Can I add the pigs tonight? Or should I do it in the morning? Should I store it in the fridge or at room temperature?

Cool room will be fine, add pigs in the morning.

I'd wait an not in the fridge. They look fab!