Valve’s huge SteamOS 3.8 update adds long-awaited features — and supports Steam Machine

Note: This update is for the Steam Deck Preview channel, and includes new features that are still being tested. You can opt into this in Settings > System > System Update Channel. Known Issue: Users not currently opted into Preview channel updates may be automatically returned to the Beta channel when attempting to opt-in. This can be worked around by enabling "Advanced Update Channels" in developer settings, and will be fixed in an upcoming Steam Client update.