does he have in mind doing the Commonwealth visits that have been postponed because of Charles' illness?
Well, IF this is true, I'd say that Harry has been FAR too critical of the RF and his father, in particular, to ever undertake such a role as the King's representative. I don't think there is any chance that Harry will be asked to undertake royal duties ever again and if he offered I really hope it was just out of politeness.
It makes you think though what might have been. If H&M had stayed in the UK and continued to work as royals, even part-time ones, perhaps dividing their time between Windsor and a country house like W&K do, they'd be major players right now. With the Queen and Prince Philip gone and with the King and Kate both out of action due to ill health, Harry and Meghan would be holding the fort and the nation would love them for it. But look at them - desperately searching for a role, influence and any kind of relevance 5,000 miles away. Reduced to giving and receiving meaningless awards and gurning for photographers they've had to tip off in advance.