Simply ‘after’ I believe, and only then, but the fact that he used Sharon (obviously a very well known figure in Israel, and pretty well known to the world) as a ‘marker’ for this prophecy would indicate sometime close to the death. Exciting that this is unfolding as Iran’s nuclear ambitions are coming to a head. Many political pundits have predicted Israel will strike Iran this year.
Additionally, this was apparently based on what he was told or heard in his dreams of the Messiah.
I don't think this would mean 100 years after the death of Sharon...but near to his death (as you originally said).;-)
I am getting excited!