Correct me if I am wrong, but I was under the impression that SpaceX is regularly delivering and returning cargo to and from the ISS and is the major launch provider for commercial sattelites. Also, the F9Heavy had its maiden flight this year.

Tesla is not only selling the Model S and X for many years, and has with the Model 3 in the meantime the best-selling electrical car in the US.

So how are they not delivering?

As rocket science is.. rocket science, I do expect delays on the schedule. Especially safety concerns can easily make a development schedule slip. Yet, the SpaceX schedule slips seem to be small compared to other space ventures. The production of the first BFS prototype is under way, we are going to see the first test hops next year.