Ever since I started using @dglt's Optimus-Switch, I wanted a graphical way to not only switch between the two cards, but a visual indicator showing what card I am using. I found a Gnome extension that worked with Ubuntu and wondered if I could adapt it to work with Optimus-Switch on Manjaro. After a couple of days of experimentation and learning, I am proud to announce that I have been successful.
It uses the "Argos" extension that allows one to use bash scripts to create extensions for Gnome. This will allow the user to not only switch between the nVidia and Intel graphics cards, but gives a visual indication of which graphics card is in use by a tray icon. Installation instructions are included in the readme.
Showing that the Intel Integrated Graphics is in use.
Showing that the nVidia GPU, and its temperature, is in use.
I had fun working on this project and I hope some of you find this useful.