Yes, the Canon EOS R8 is compatible with the ProGrade Digital V60 128GB SD.
ProGrade V60 writes at 130 MB/s on a UHS-II bus. Canon R8 4K30 minimum is 30 MB/s (UHS Speed Class 3) with UHS-II bus required. Both conditions met -- 130 MB/s write on UHS-II passes.
“Canon EOS R8 Compatible Cards: SD/SDHC/SDXC with UHS-II and UHS-I supported; for movies use a card with ample performance (fast enough writing and reading speeds) per Canon online manual.”
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Confidence: inferred