Yes, the Canon EOS R50 is compatible with the ProGrade Digital V60 128GB SD.
ProGrade V60 is UHS-II rated at 130 MB/s write. Canon R50 has a UHS-I slot — UHS-II card operates in backward-compatible UHS-I mode. At UHS-I speed, card still exceeds R50's 60 MB/s 4K30 minimum by a wide margin.
“Canon EOS R50 Compatible Cards: SD/SDHC/SDXC memory cards — UHS-I cards supported; single-slot camera per Canon online manual.”
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