If you want to know where we are with Iran, read Fred Kaplan and Daniel Larison. These men are far apart on the political scale on most issues but they generally agree on matters that relate to U.S. military action and keeping the peace with other countries. They both say it's far from over over there.
Seems to me Trump's goal now is to get to the exact same place with Iran that Obama achieved with The Joint Comprehensive Plan of Action (AKA "The Iran Nuclear Deal") but to be able to argue that he was right to renege on it and what he's accomplished is so much better. And if there have to be assassinations and wars and uncertainties and tensions to get there, it's all worth it because, you know, it's all about Trump.