I am getting ready to upgrade from openproject V11 to V12.  I am trying to find any information on the site about if there any special procedures that need followed. I am not finding anything.  Is it as simple as running apt update apt upgrade or is there more to it?

In your OP installation, check your profile > Administration > then the tile Information, you can find there a link to the guide on how to upgrade postgresql to 13 first.

Unless you already run it, obviously.

Already upgraded postgres back when the install was on 11,  thats all set.

So then it seems it is just a regular upgrade.

Upgrade of major releases needs an additional step. Follow these instructions: https://www.openproject.org/docs/installation-and-operations/installation/packaged/