“Immediately after the distress of those days, the sun will be darkened, and the moon will not shed its light; the stars will fall from the sky, and the powers of the heavens will be shaken. Then the sign of the Son of Man will appear in the sky, and then all the peoples of the earth will mourn; and they will see the Son of Man coming on the clouds of heaven with power and great glory. He will send out his angels with a loud trumpet, and they will gather his elect from the four winds, from one end of the sky to the other.”

Matthew 24:29-31 | cross ref: Mark 13:24-27 and Luke 21:25-28.

Jesus has clearly not yet returned to the Earth. However, there are many Biblical prophecies that point to His return in the very near future. That being said, this could be your last day. Tomorrow is not guaranteed. That is why the Bible calls for us to be ready at all times…
See Second Coming via Wikipedia and Jesus Said He’d Return Soon, So Where Is He? via Desiring God and Messiah 2030 Project.