Couple things on the large scale tactical aircraft activity over the Middle East tonight:
I don't have any info on this operation or if it truly has gone kinetic, but here is likely what is happening if not:
1.) Dry runs are important for such a large integrated operation. They can be scaled as the operation gets closer. Getting a large part of the intended force up and in position can really help with the chances of mission success if the actual order to execute is given. So many moving parts to align. Not great to find out any weak spots on night one of a new offensive.
2.) Stimulating Iran's air defenses is critical. By Iran operating as if a full scale attack could be coming, their air defenses can be detected, categorized and geolocated. This is absolutely critical prior to a major air operation. Surveilling them during times of lower alert does not provide the same fidelity of actionable intelligence. Knowing where those threats are and how they are operating can mean the difference of life and death and/or will help standoff munitions make their way to their targets as those defenses can be suppressed, destroyed, or avoided entirely via careful mission planning.