The only thing that "solved" it for me was a clean install. Since I was able to get into Safe Boot, I did that first, transferred the few files that I didn't already have synced and then booted into Recovery Mode, wiped the existing drive followed by a clean install.
Everything is running now, but that's really more of the "****" option :/
Tehnix
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Same issue here:
Left it overnight, no progress
Rebooted and tried again for an entire day, no progress
Booted into Safe Mode (hold down shift on startup before the Apple logo), it seemed to finish the update
Booted into Normal Mode, still stuck
Went into Safe Mode and disabled File Vault
Booted into Normal Mode, still stuck
Don't know what's left to try. I can get into Safe Mode to change things, but it's horribly slow and laggy. Considering a full clean install and trying again.