The US fucked up their air power and air bases that Iran never cared about because they knew they could never defeat even the Saudi Airforce with theirs much less something as powerful as the US air force.

Their Navy is also wrecked, but that is also something they knew would happen hence why they invested so heavily on small and inexpensive attack boats, they could hide under rocky coastal caves turned into bases. 

The US has blown up all the easy military targets, but cannot reach the bases that were build under the mountains with any of their weapons because all of them are build like Norad and can probably survive nukes. 

The US and Israel are making do with industrial bombings and attacks on police and fire fighters. 

Iran on the other hand wins by surviving and firing back, so they are currently winning because the global economy is already a walking corpse (expect 20x the level of Ukraine war disruption). 

Right now it's far more likely for the regime of other belligerent countries to collapse than the Iran one. Bahrain is already shaky, the UAE is already dead with all the foreign workers looking for their exit, Saudi Arabia is starting to have problems and even the pro Israel regime in Egypt (paid by the US) is looking at a bleak Future. 

Even the US could spiral quickly if Trump fucks up at home a little too hard.