My Question is this - Does anyone think my flowers will wilt?????
It depends on what the gumpaste is made from, where the cake is stored, and what the humidity level is. If you're using a quick gumpaste that's not really gumpaste but is fondant with tylose in it, that has more of a chance of softening up than a gumpaste that has no glycerine in it. If you put the cake ina box that doesn't let the air circulate around it, the moisture from the buttercream can recirculate into the gumpaste and soften the flowers. The safest thing to do would be to put the flowers on right before delivery, and tell the people who are taking the cake to store it in a non-humid place with the box open so that air can circulate into the box.