I was actually going a different direction.
As for their salvation, there are two main catagories of Jews. Those that died in the faith looking forward and those that existed after Christ. If you blanket statement all who died looking forward as being saved then all current Jews will also be saved at the second coming. I leave that decision to God because the covenant was between he and the Jews. I will say this;
Jeremiah 31:33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
There were many covenants between God and the Jews including this one where he promised to forgive their iniquities and remember their sin no more. A covenant is between two parties and both parties must keep to the conditions of the covenant is null and void. Israel never kept their part of any of the covenants to include this one which brings us to the Church.
This particular covenant had a loophole in verse 27...
Jeremiah 31:27 Behold, the days come, saith the LORD, that I will sow the house of Israel and the house of Judah with the seed of man, and with the seed of beast.
Verse 27 is saying Christ or the Mesiah would come and join Israel, Judah, the seed of man and the seed of the best (what ever that is). God kept his word and sent the Mesiah but he was rejected. Does this still bind the covenant?
I don't consider the Jews period as a Church because the relationship was with the first part of the God head. The Church was built and hinges on the second part of the God head. It is he who makes us righteous, is the reason are iniquities are forgiven and he doesn't remember our sins.
Had Israel accepted Christ I would say yes, the Church would have reached back and included Israel. Because they rejected the savior and broke all the covenants?????? <scratches head>
Do you recall the joke ending with I sent a boat, a helicopter etc...