OK, looked at the questions, wondered myself.
Limited support, you can track health/sleep if you tie in gadgetbridge, no voice commands.
base features:
Agenda Alarm clock Calculator Music controller Settings Stopwatch Timer Weather app Up to 48 hours of battery
AsteroidOS 2.0 features:
Always‑on display Tilt‑to‑Wake Customizable QuickPanel Multiple launcher styles Nightstand mode Performance improvements Support for ~30 devices
https://asteroidos.org/ https://gadgetbridge.org/ (with active development for asteroid)