Hi Brandon,
The Focus mode on the Mac relates to notifications only. The ringtone for Zoom Phone is not a notification. It would be a great enhancement though for the Zoom app to automatically set your Zoom status to follow your Mac's Focus mode!
You can set your Zoom status to Do Not Disturb in the Zoom app by clicking on your profile image/intials in the upper right-hand corner of the app.
I hope this helps!
Craig
Craig