Make the cakes whenever and freeze. You can make the fondant store in a ziplock bag. Then nuke for a few seconds before kneading. I have coloured fondant that I've made and kept and lasts for ages.

Thursday to Saturday is a bit too long IMO. It really depends what you put under the fondant. I use buttercream and ganache so I wouldn't do it that long in advance. A day maybe but not 3.