Here is a crusting cream cheese recipe that can stay our of the fridge for at least 12 hours.
I have also read in a few places the cream cheese is ok out of the fridge once it is mixed with the powdered sugar. The sugar acts as a preservative. It can’t last for days but 12 hours will be ok.
As for fondant I put my cakes in a box and then in the fridge. I take them out a few hours before delivery to the the condensation dry. Thea Jo is right as long as you don’t touch the gumpaste/fondant it will be ok