Check the official supplemental tax info letter from the investment company which contains these %s that's the official source for filing; I don't think you get quarterly breakdown but they should tell you whether it meets the threshold. e.g. Vanguard has a footnote "* This fund meets the threshold requirements for California, Connecticut, and New York, which require that 50% of the fund’s assets at each quarter-end within the tax year consist of U.S. government obligations."
If you're a high state tax you would ideally want to be in a MM fund with highest possible US Gov obligations that invest directly in Treasuries rather than repo market etc, E.g. Vanguard's VUSXX (100%) instead of VMFXX (60%); Fidelity's FDLXX (97%) instead of SPAXX (55%). (2024 %s). Firms like Vanguard or Fidelity use lower US Gov % funds as default for cash management so you have to explicitly buy into these other funds.
https://investor.vanguard.com/content/dam/retail/publicsite/en/documents/taxes/USGO_012025.pdf
