Iran will follow a similar course as North Korea.
As there are details of the breakdown in the agreement that are disagreed on by multiple parties to it, I've modified the original reply to James removing a good deal of detail, reducing it to the essentials. Still using the same timeline.
In any event, the agreement with North Korea was only a few pages long. The Iran deal was quite lengthy and detailed. Iran, like North Korea, was abiding by the deal including robust inspections.
Since you seem to enjoy making predictions like the above, or "millions of people will never see their second doses", and countless others, with an Iran free from any agreement how long do you think it would take for a horrific war to break out.