Realism suggests IRGC is in control of the country. The President's optimism for a deal is a negotiating tactic: posit success make the other side reject, justifying next steps.
The President is facing criticism from the left and from some in his own party, including
"it's taking too long [to take down one of the 11th ranked military in the world]; "
"it's a foreign (or Israeli) war;"
"the messaging on objectives is incomplete, contradictory;"
"this military action violates the War Powers Act."
"it's increasing the price of everything."
Declaring a successful conclusion to Operation Epic Fury and Iran's agreement might answer, to a substantial degree, these complaints.
The interim also allows increased intelligence activity for and sets a rationale for the next military action if Iran continues it's nuclear program, re-development of offensive capabilities, asserting national dominion over the Strait, or support for terrorism.