TD Ameritrade does not seem to encourage the purchase of VMFXX. On my screen, all I see are the 0.11% expense ratio, a $3k minimum investment except in IRAs, a 2.63% TTM distribution yield, and a 0% SEC 30-day yield.
Superficially, that doesn't look as attractive as just buying t-bills, now at 5.1% for the four-month duration or the easier to handle ETF SGOV with a 30d yield of 4.64%, or CLTL with a lower expense ratio than the Vanguard fund and a 4.54% 30d yield.
But I get the point. Rates have risen, past info is not applicable any more, and the future yield will be higher. This is just a cautionary tale about shopping for safe money funds through your brokerage based on the numbers displayed. When rates are a-rockin' you can't take the yield field at face value.