Technically, he may have already pardoned them .

Acting pursuant to the grant of authority in Article II, Section 2, of the Constitution of the United States, I do hereby:

(b) grant a full, complete and unconditional pardon to all other individuals convicted of offenses related to events that occurred at or near the United States Capitol on January 6, 2021

It happened on Jan 6 and it was near the Capitol, right?