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There is massive amount of uncertainty here, and nobody will know the answer if/until it gets to SCOTUS.
Also there is a lot of speculation about how specific the pardon has to be. There is a massive Catch 22, do you say I pardon myself for anything I have done/will do, or do you describe in detail your crimes that you are pardoned for, running the risk that you've told everyone exactly what you've done, and SCOTUS may decide you're not immune, and send you down for it.
'preemptive pardons can be done' says yale prefessor Bruce Ackerman on BBC just now.
Also ‘strong case to be made...that his actions were a knowing violation of the insurrection act of 1807..he could
go to prison for the rest of his life..’