Hours for the MSP community testing site (I believe this is the free one in the T1 parking ramp) are 7 am to 7 pm everyday. Appointments are recommended but not required. They do a saliva PCR test, presumably Vault.

There's also a community testing site at the Minneapolis convention center, presumably the Vault saliva test. It's open from 9 am to 6 pm, but will be closed on December 24/25/31 and January 1, possibly also December 30.

AFAIK the Vault tests must be processed in a lab (in Oakdale IIRC), so these wouldn't be instant tests.