Interesting - “It is finished” was the battle cry of a field general as he declared victory at the completion of the battle. And as I read it, Jesus refused the wine at the cross. The fourth cup is the cup of redemption, and he did not drink of it until after the resurrection.
At least, that’s the way I read it.
Thanks,
After this, aware that everything was now finished, in order that the scripture might be fulfilled, Jesus said, “I thirst.” There was a vessel filled with common wine. So they put a sponge soaked in wine on a sprig of hyssop and put it up to his mouth. When Jesus had taken the wine, he said, “It is finished.” And bowing his head, he handed over the spirit. (John19:28-30)