Don't put it in the fridge!!! When you take it out (assuming it's already in there) make sure it is in a very dry environment. dessicated even. The fondant will go very soft and the flexi might even fall off if it gets too damp.
It would be fine just on the bench or in the pantry uncovered till Christmas day. Humidity and moisture will be your only enemy. It wont dry out. The fondant will keep all that lovely rummy moistness in. The cake itself is totally sealed, so it wont go dry now. You only need to keep 'feeding' a fruitcake if it remains uncovered for long periods of time.
So glad it arrived in one piece. Amazed at how quickly it got there. That was only 1 week! Last years I sent via the same method and it took over a month. You just never can tell.
Anyway, I hope it lives up to expectations.