With macOS Big Sur 11.3 beta installed, the system now shows a HomePod pair as a single option in the sound output list instead of showing each HomePod separately. Once you click on the pair of HomePods, the system will automatically use them to play sounds in stereo mode.
The site suggests that the new feature could indicate that Apple is finally planning to implement system wide support for AirPlay 2 in macOS.
You can learn more about what's new in macOS Big Sur 11.3 beta 1 here. Please download the iClarified app or follow iClarified on Twitter, Facebook, YouTube, and RSS for updates.