Hi - do you mean the MaterialShapes for Diamond, ClamShell, Ghostish, Clover4Leaf etc? I see those are still experimental, i.e. annotated with ExperimentalMaterial3ExpressiveApi. I'll find out what the status of those is and whether they will soon be released as stable, which would help for releasing on wear compose.
Good question about the wavy progress indicators, they do seem to be stable for mobile.