Jesus was talking specifically about the Mosaic Law when He said “till all be fulfilled.” And He clearly meant “till all be fulfilled” in the Mosaic Law. He even clearly said that He came to fulfill it. And He did fulfill it. He wasn’t talking about the end of time or anything else.
He’s the only person who ever lived the Mosaic Law perfectly. Peter and James both made it crystal clear at the First Jerusalem Council that both Jews and Gentiles are saved by grace alone through faith in Jesus alone. And they reiterated that every single Jew who had ever tried to abide by the Law of Moses had been a dismal failure at it. Except Jesus.
The Abrahamic Covenant is an unconditional covenant of grace. The Mosaic Covenant is a conditional covenant made ‘only’ with the Ancient Israelites, and it…along with its 613 commandments…no longer stands. The New Covenant is an unconditional covenant made with all of humanity, it is everlasting and was initiated by Jesus Himself. It’s the covenant that Jeremiah prophesied about in the old testament.
I am sorry to be repetitious and I know you don't like it because you have pointed that out but heaven and earth have not passed away and God's covenant with the Jewish people has not been annulled. If that would true then God would be a liar.
Patriotism (and religion) is the last refuge of a scoundrel.
