And I will pour on the house of David and on the inhabitants of Jerusalem the Spirit of grace and supplication; then they will look on Me whom they pierced. Yes, they will mourn for Him as one mourns for his only son, and grieve for Him as one grieves for a firstborn.” Zechariah 12:10 (NKJV)
Paul the apostle speaks of the salvation of all of Israel (Romans 11:26), and the Old Testament spoke of it coming to pass long before the apostle was born.
It has not happened yet. They did pierce His hands and His feet (John 19:34, 37; Revelation 1:7) and the resurrected Jesus invited the doubter [Thomas] to touch the wounds in His hands and side (John 20:27).
One day all the people of Israel will see Jesus with His scars, and they will bow before Him, knowing that He is the Messiah, the Christ.
All who live today can bow before Him today, and submit to His Lordship, and live eternally in His presence. Call on Him today.