My common interpretation of a war is that it involves the continuous exchange of violence on both sides over some time. An isolated bombing operation isn't what I think of as a war. Israel and Iran are at war for sure. The US and Iran, we'll see. It's possible Iran will calculate that it is not in their benefit to wage an open war on the US.

There's is already a history of violence between Iran and the USA. Was that a war? When Iranian funded militias attacked American bases is that war?

Anyways, that's how I think about it.