We wish to install all on MacOS using Google Fonts on MacOS.

Approach

cd ~/Library/Fonts/
git clone https://github.com/google/fonts.git google-fonts

This will clone the Google Fonts repository thereby creating the directory google-fonts.

Open User section in the Font Book app. All the Google Fonts will be indexed there.

In the event that Google adds more fonts update the fonts like this:

cd ~/Library/Fonts/google-fonts/
git pull