They may have nukes, and the supplies to keep them mostly up to spec.
The question is, will attacking Iran trigger an assault by them? I doubt it. It'll be random and a bolt from the blue style massive attack.
If they had them, and that is a big if, to say they have the supplies to keep them up to spec is a stretch. They certainly possess some of our stingers left over from the russia/afghan conflict, yet they can't keep them up to spec, or they would have put down signifcant numbers of allied aircraft in the past few years. Nuclear weapons are infinitely more difficult to maintain, not just in terms of materials such as tritium(which is needed for the triggering mechanism, and has a relatively short half life), but more importantly in terms of the expertise needed to keep them operational.
CA....