The ONLY question at this point is..
Does Iran have nukes?
“Does Iran have nukes?”
It has the ability and the material to make several nukes.
I believe it has missiles able to reach Israel carrying a nuke.
However, Israel has about 350 nukes I believe, and Israel is quite likely to be able to stop Iranian nuclear tipped missiles from reaching a major Israeli city.
WIKI
the US’s W47 of the UGM-27 Polaris weighed only 330 kilograms (730 lb). This meant that much smaller rockets could carry these new warheads to the same range, greatly reducing the cost of the missile, making them far cheaper than bombers or any other delivery system. When Nikita Khrushchev angrily boasted that the Soviet Union was producing new missiles “like sausages”, the US responded by building more ICBMs of their own, rather than attempting to defend against them with Zeus.
Safeguard was a two-layer defense system. The long-range Spartan missile would attempt interception outside the Earth’s atmosphere. The missile’s long range allowed protection of a large geographic area. If the Spartan failed to intercept the incoming offensive missile, the high performance and high speed but short ranged Sprint missile would attempt an interception within the atmosphere. Both missiles used nuclear warheads, and they relied on destroying or damaging the incoming warhead with radiation rather than heat or blast. The Spartan carried a weapon with a 5 megatons of TNT (21 PJ) yield; the Sprint in the 1 kiloton of TNT (4.2 TJ) range.
Remote Sprint Launchers were established around the MSR main complex in order to place missile launchers closer to their intended targets, and thus reduce the flight range to the targets. Four sites were completed, and they still remain there, 10 to 20 miles (16 to 32 km) around the MSR complex in Nekoma, North Dakota.
https://en.wikipedia.org/wiki/Safeguard_Program
That isn’t the only concern. If they’re just waiting for their partners including Lebanon and Syria to get prepared it will still be messy. The Iron Done success rate is 85-90 percent. If they send a ton of missiles at the same time it’ll still be horrible.