But since I am still stuck at building and compiling Pixar USD to work on my Mac, I am tackling just the USDZ Converter and looking at the USDA.

Ideally, there should be Add-On for Blender for USD and USDZ export. If not, I am hoping Blender developers can help with this.

I am using Animation Nodes to help me with USDZ Converter Command Line in relation to PBR Material and textures. It is just an idea, hopefully can trigger more ideas.

Enjoy!