Monterey upgrade will not complete
I've gotten all the way to restart and 58min left the it won't complete.
MacBook Pro 13″, macOS 11.4
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Do you have enough free disk space?
If upgrading from macOS Sierra or later, your Mac needs 26GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44GB of available storage.
Also uninstall any antivirus and "cleaning" apps before trying installing again.
Further, you need an Apple disk installed to upgrade to Monterey since the upgrade includes an update to the Mac's firmware. That update looks for an Apple disk and write to the dick to do the firmware update. The install will terminate or freeze if no Apple disk.
Some users have problem if Big Sur was not fully upgraded prior to trying to upgrade to Monterey.
Terminate the install.
Boot to Safe Mode, that boot takes minutes, and redownload the Monterey installer and then try upgrading again.
How to use safe mode on your Mac - Apple Support the existing installer which is in the Application folder.