Iran now has 100% of the prerequisites for a nuclear weapon including enriched special materials and it would be surprising if they didn’t have a handful ready to go. And very likely that NK has provided technical expertise and even smuggled parts (such as primary detonator assemblies, etc).
Do you understand the difference between having a nuclear weapon the size of a VW beetle and having a war head that will fit on an ICBM? Iran is not going to do a nuclear attack on anybody.