No it likely wouldn’t make them explode if they hypothetically were there.

It’s reasonably certain that Iran didn’t and doesn’t have any usable nukes. The claim is that they were working on building them and that the bombing was to stop them from completing any such projects.

There are conflicting opinions about whether they were really working on building nukes. One might reasonably also say that if they weren’t working on it before, they are NOW.

IIRC there was some kind of religious fatwa against Iran building nukes, which made the claim somewhat credible that they weren’t building them. It looked to me like they were instead getting the precursor materials together without doing the final refining and assembly, so that if the fatwa was lifted and the clerics said build the nukes, they could do so relatively quickly. That’s just me though, and I don’t have any special sources of info.