Only God knows the time and the hour when Jesus will come back (Mat 24:36), but we do know that His return is drawing closer and closer.
We don’t know when Jesus will return. It just might be in our lifetime. Therefore, we (Christians) have work to do.
We have been commissioned by Jesus to tell the world that He came first as a suffering servant to seek and save the lost. He was the Lamb of God who died for the sins of the world. We are also to tell that Jesus will come again, first for His Bride (the Rapture), and then with all the Saints (the Second Coming).
Read more about when Jesus returns here.