Well, if it’s not doing anything, I’d probably reboot. Then re-run whatever the command is that triggered the update.

Worst case, if you can’t boot up to a graphical environment, I expect that you can probably boot it into a non-graphical “rescue mode” or similar from GRUB. I dunno if Fedora shows it by default, but IIRC holding shift should stop boot at GRUB, or tapping an arrow key when it’s up. It’ll let you log in as root. When you do, just repeat whatever command was used to trigger the update.