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He can’t be pardoned for something he has been convicted of, yet.
Apart from actual precedent for federal offences:
Now, THEREFORE, I, GERALD R. FORD, President of the United States, pursuant to the pardon power conferred upon me by Article II, Section 2, of the Constitution, have granted and by these presents do grant a full, free, and absolute pardon unto Richard Nixon for all offenses against the United States which he, Richard Nixon, has committed or may have committed or taken part in during the period from January 20, 1969 through August 9,1974.
He can’t be pardoned for something he has been convicted of, yet.
At least that’s seems to be the general consensus.