We're not going to get the best case scenario. We're going to get close to the worst. For political reasons, Trump has to appear to win, and Iran has to appear to not let Trump win. This makes it impossible to find a halting condition, and so the war continues until one regime or the other falls. (The least dramatic way that could happen is for Congress to pass a War Powers resolution, which effectively ends Trump's ability to use the military for this. But that won't happen until at least after the midterms, if then. So we're stuck in this for a while because of the logic of both countries' internal politics.)

One out would be for Trump to lie about having met all the objectives (not that anyone seems to know what the objectives are) and then stop the aggression. His lies would likely be accepted by the U.S. media and MAGA supporters and meanwhile the rest of the world would recognise that Iran made a mockery of the USA.