As soon as you install the material library with one of the methods below:
You can find the YMA Toon Studio_USD category after the non-usd materials:

The USD materials are identical except saved with the RS USD Material Builder container.
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The steps to see the USD materials on the OD Asset Library are the same as the non-USD materials, just need to point to the od_lib_**usd** folder instead of od_lib.(step 2).
You can have both libraries added into the OD Asset Library.

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Make sure to have OD Tools installed.
In Houdini, open the OD Asset Library pane, and add $YMA_PAINTERLY/od_lib_usd to your saved folders
Go to the Library tab and select the $YMA_PAINTERLY/od_lib_usd directory, you will find the collections as a Sub Dirs on the top right corner of the Asset Lib