The United States is no longer bombing Iran, not because they are afraid, nor because they lack ammunition, but because they have found a better strategy.

Forty days of American bombing have already deprived Iran of air superiority. The current naval blockade is even more effective, and also costs less, reducing casualties.
The U.S. Navy remains the world's number one, with three aircraft carriers blockading the strait, making it almost impenetrable. No ships can escape the eyes of the U.S. Navy—satellites in space, unmanned reconnaissance drones, and early warning aircraft form a web of surveillance.
What about the Iranian Navy? It has almost been completely destroyed; now only some small vessels remain. Facing destroyers of several tens of thousands of tons and aircraft carriers of hundreds of thousands of tons, they are simply not in the same league.
By blockading the Strait of Hormuz, the United States is effectively blocking Iran’s economy.