This prophecy speaks of a river that will issue from the temple mount (perhaps even directly under the temple itself) and will go out from that area and become a raging river and will have a major impact on the land all around. From what can be best determined, the first tricklings of this have started. The 3rd temple still needs to be built, and we may even have to wait for the Millennial temple as well before this is complete. But in the meantime the first parts of this have started.
(*Do you have a better description, or did you find an error? Please let me know.