If they actually had nukes already, none of this would be happening.

Something would be happening.

Israel seems perfectly happy to unleash wave after wave of terrorist attack and assassination campaign on individuals within the Iranian government. To date, this tier of attack has failed to cause any country to break the nuclear taboo. We didn't nuke Afghanistan after 9/11 (although a few fringe elements suggested we should). Russia hasn't used nukes in Ukraine. Despite suffering their own wave of terror attacks, France and England haven't unleashed nuclear hellfire in North Africa or the Middle East. Indian and Pakistan haven't traded nukes over their border disputes.

Would a nuclear-armed Iran drop a nuke over Solemani or the pager bombs against Hezbollah? If nuclear-armed Israel can keep their bombs on the ground, I have to assume Iran wouldn't be any more extreme.