Is the Xcode Updater Stuck?
Apple’s Xcode upgrades are notoriously big to download and slow to install. And sometimes it’s not clear if it’s actually still working or if it’s just stuck.
You can check by watching
install.log. Open the Console application and look for it under Log Reports. Or if you’re comfortable with the command-line and Terminal (which seems likely if you’re using Xcode in the first place!), just run
tail -f /var/log/install.log
Either way, you’ll be able to see whether the updater is still doing something or not!