Can somebody confirm that this command cannot convert .abc format to usdz yet?
I downloaded the usdpython folder from Apple dev link and double clicked the terminal USD.command, not sure if I need to do any other setup.
I haven't been able to convert .fbx or .abc with usdzconvert.
Have you tried importing the .abc to a SceneKit scene and exporting the usdz from there? I have had (limited) success using dae files with this method.