Had an idea after borking my system with "sudo reboot -h 15" non existing command

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sudo and -h is not needed. To shutdown system with a 15 minute delay:

$ shutdown +15
Shutdown scheduled for Sun 2024-03-17 17:46:59 GMT, use 'shutdown -c' to cancel.

But for updating packages, it would be better to inhibit system sleeping, shutdown and idle :

systemd-inhibit pamac update --no-aur

Or build pacman-systemd-inhibit from AUR

For more immunity from PEBCAK issues, disable power button and laptop lock-switch so they cannot be used to shutdown system, and learn how to reboot/shutdown a system safely
[HowTo] reboot / turn off your frozen computer: REISUB/REISUO

If mains power is not reliable for updating a desktop system, get an Uninterruptible Power Supply

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