Yes, it is finished but look what just happened!!!
Mark 15:37-39
With a loud cry, Jesus breathed his last. The curtain of the temple was torn in two from top to bottom. And when the centurion who stood there in front of Jesus heard his cry and saw how he died, he said, "Surely this man was the Son of God."
The most amazing event...the curtain of the temple was torn in two from top to bottom. The curtain that separated the Holy Place from the Most Holy Place (Ex. 26:31-35)being torn, indicated that Christ had entered heaven itself for us to that we too may now enter God's presence.
This is part of the great mystery. We are no longer separated from our Heavenly Father. We can come boldly before the throne room of our heavenly Father.
Look further at Hebrews 9:11-28
He entered the Most Holy Place once for all by his own blood, having obtained eternal redemption. vs. 15 For this reason Christ is the mediator of a new covenant that those who are called may receive the promised eternal inheritance" -now that he has died as a ransom to set them free from the sins committed under the first covenant.
We are set free! A great earthquake, rocks split, tombs broke open, people were raised to life and appeared to many people. This was an extremely dramatic day for the believer as well as those who continued to doubt. Rejoice He is coming back again.