A similar issue happened to me as well. Mine currently shows 96% and it hasn’t moved in 2 days either. I am unsure about what to do.
I am on a limited satellite broadband data cap. It is very frustrating every time an update occurs. I have to uninstall and then re-install the game in order to apply all of the previous fixes just to be able to download and apply the latest update that is required. That alone is equivalent to 2 months of my data limit. I wish there were a way to obtain these fixes on a physical media or even a separate web link to manually download them to a flash drive and then insert it into the XBox One.