If he chose to pardon Manafort, I suspect Mr. Trump will have to wait until the end of that second trial. I’m told that Manafort has yet one more trial of ‘this & that’ to deal with now cobbled together by Mueller.
No, the president can pardon him for any federal crime, even if he has not been charged.
Does anything stop Trump from, with his own money, helping Manafort with his finances?