If they had already developed them, then we wouldn’t be having this discussion because nobody is going to war with a nuclear armed state.
The question is only, did they have the means to, and was there an indication they were? The answer is yes. They were enriching uranium at levels that go beyond anything non-nefarious. Their lead nuclear scientists were going to be meeting with their ballistic missile scientists (according to the dossier.)
On would it be worth it: nuclear proliferation is probably the most dangerous existential threat that humanity faces that is completely preventable. Iran is the most destabilizing country in the region and the cascade of nuclear proliferation that would occur if they succeeded would be a nightmare. That is easily worth $3T.
