If we’re talking ‘standards’ I think one could take reference from example assets and asset structure guidelines out there. But the thing with “USD” being universal also means that it can be bend many ways and brings along flexibility that make it somewhat harder to say: “This is the standard.”
Example assets
Not all are ‘production scenes’ but they are all, in some form, references to how USD can be used.
Asset Structure
- ASWF Guidelines for Structuring USD Assets
- NVIDIA Docs: USD Asset Structure Principles
- OpenUSD - Should I reference or sublayer?
- USD-wg: Guidelines for Structuring USD Assets
USD Guides
If you’re just looking for an even bigger list of ‘resources’ - then this vfxpro99/usd-resources list may help, including a list of integrations for USD
USD has been around a long time at Pixar, but also as @dhruvgovil pointed out has a track record within VFX in multiple studios. However, over the last few years this has even extended to other industries with Omniverse and other integrations pushing boundaries there as well with big support from big companies like Nvidia, Pixar, SideFX, Autodesk, Maxon, etcera.
However, even though that’s the case it’s a big product with constant development so resources from years ago might not apply as much to Today, especially with things like “what DCCs support it?” and “what integrations are there?” because it’s a massive evolving ecosystem. As such, you might benefit from seeing “recent” usage, e.g. searching and watching Youtube talks by big studios on their usage of USD in recent VFX projects or alike (or wherever your interests are).
The USD Working Group presentations recordings are just a small blip of what is out there.