UE 5.1 - Meta XR 54.0 not showing up

Another day another bad experience with Meta Quest Pro / Unreal Engine

I am using Ubuntu and Unreal Engine 5.1.1

I downloaded the latest version (54.0) of the Meta XR Plugin

I put it in the Plugins/Marketplace folder.

It does not show up in the project settings.

What am I doing wrong?

General Feedback:
- Why is the Plugin Version called 54.0?

- Why does it say in the plugins list its 1.86.0?

- Why is the documentation so outdated?

- When is the plugin version for 5.2 coming out?