Good, but mass adoption is a lot slower in sites than in browsers it seems. It's like pulling teeth making sites to actually support even AVIF which is already widely supported in browsers. A ton of inertia even on sites like GitHub and GitLab. Try using AVIF on Wikipedia? Tough luck.

Imagine how long it will take for JPEG XL that didn't even reach wide browsers support yet.

Side note - comparing JPEG XL and AVIF features wise is sort of pointless if AVIF will continue to evolve based on AV2 and etc.