What’s the best way to use a Canon 60D as a webcam on MacOS?
From what I have found, using Canon 60D on Mac has the following challenges:

There's currently no listed EOS Webcam Utility for Canon 60D on Mac. There do seem to be some people succeeding with workarounds by installing drivers for similar Canon models (e.g. 77D) - but I was not successful.
--EDIT: As of 2020-11-11 there are now drivers available for 60D on Mac.
Using micro-hdmi and a USB capture card, after flashing my 60D with the latest Magic Lantern firmware I was able to get 'clean hdmi' output, but was only able to get 480p output (instead of the almost-1080p output that should be possible).

You could perhaps have more luck with https://github.com/v002/v002-Camera-Live or waiting until updated Webcam utility drivers are released that support the 60D.