Re: playing music from Mac not iPhone on home pod
It may not be exactly what you are looking for:
Yet it seems you can use AirPlay to hear songs that are playing on your Mac play on HomePod as well.
On your Mac:
You need to be signed in to Apple Music with your Apple Account details and have a song playing:
Click the AirPlay button, and choose the HomePod checkbox.
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More info: Use AirPlay to stream audio - Apple Support
Eg: says:
Stream audio from Mac
Make sure your Mac and speakers are on the same network. Open the Apple Music app, click AirPlay
in the playback controls, then select a speaker or multiple speakers.
If you can’t see the AirPlay icon
or if you want to stream audio from a different app:
- On your Mac, select Control Centre
in the menu bar. - Click AirPlay
under Sound. - Select a speaker you want to play the current audio on.
You can’t use AirPlay to stream audio to multiple speakers from Control Centre on a Mac."