What signs come before the Second Coming according to the prophecy Peter quoted?
According to the prophecy Peter quoted, before the Second Coming there will be wonders and signs in heaven and on earth: blood, fire, and vapor of smoke; the sun will be turned into darkness, and the moon into blood, before that great and notable day of the Lord comes.
Les explains that Peter, unlike Jesus in Luke 4, did not stop at the end of His ministry but continued the prophecy as if it would happen in that generation. Peter goes right on with the prophecy, showing wonders and signs in heaven and on the earth beneath: blood, fire, vapor of smoke, the sun turned into darkness, and the moon into blood, before that great and notable day of the Lord comes. Les identifies that day as the Second Coming, just exactly like the verses in Matthew, and notes Peter had no idea it would be interrupted by two thousand years.