Homepod
Can I stream music on the HomePod mini even if my phone battery dies or is not at my house?
Question marked as
If you have a music service, such as an Apple Music subscription, set up on your HomePod then you can tell it to play music directly via Siri (talking to it). You can also ask the HomePod to play radio stations.
See if the following information helps you
https://support.apple.com/en-gb/guide/homepod/apd414437fc9/homepod