At 31:15 (https://media.ccc.de/v/39c3-asahi-linux-porting-linux-to-app...) there is a mention of someone working on M3 Asahi bringup.

This led me to the following article, which has more details, including a Doom screenshot: https://www.phoronix.com/news/Asahi-Linux-EOY-2025-CCC