The signs are there if you look for them. But one has to be careful in interpreting them. But, earthquakes and eclipses are mentioned as a warning bell.
The sure sign is found in Daniel 9, esp. erase 26. In His first earthly appearance in human form, the Messiah will be killed in Jerusalem 483 years after the degree from Cyrus was issued, and the Mosaic/Davidic Covenan will be abrogated, abolished, finished in Jeho AB’s Plan.
At the instant of His separation from His non-functional (but still sinless) body, the Jewish religion was, and is, just as dead, never to be again in effect with Jehovah. And at that point, still one heptad (week) of years still remain to finish God’s judgment on Israel and the world they had been assigned to evangelize.