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What worked for me was to uninstall Xcode first. This proved difficult because macOS reported that some extensions were being used and it wouldn't allow me to delete from the Applications folder. I had a second account on my computer and after logging in to that account I was able to successfully move Xcode to the Trash and empty the trash (emptying is an important step). After Xcode was successfully uninstalled, I rebooted and then re-installed from the App Store. I suspect that the update process was hanging for a similar reason that was preventing me from uninstalling Xcode initially, as to what that detail was exactly is unknown to me. But now I'm set!