Depending on how long it takes you to decorate, complexity of the design, etc. I'd take them out tomorrow morning and let them sit on your counter while you make your BC. They should be wrapped while defrosting, I like to torte/level while partially frozen-this makes the cakes easier to cut. So I only let them defrost a little bit, the time it takes to torte my cakes-this way most of the condensation forms on the Satan wrap and not on my cake. Keep in mind, this is how I do things, feel free to do whatever you want
I stack each cake on foamcore (cake round), layer, fill, crumb coat then I let my cakes settle overnight. This is a very important step! It helps avoid buldges in your finished cake. If you don't have time to let your cake settle overnight use Leah's tile method-place a lightweight object on top of your cake, you don't want to crush it, but the object should be large enough so the weight is evenly disbursed-I will do this for a few hours.
You can do your final coat the same day or leave this for Friday, cover with fondant and decorate. I would have them finished Friday night if delivery is Saturday or at least the majority of it.
If you have any fillings that are perishable you'll need to refrigerate. You can refrigerate your fondant cake if you want, it's a great debate around here, so that's a personal preference. Cold cakes make deliveries much easier.
Please don't take offense, but is this for a customer?