i repeat, RCs should at least be able to concur that the Lord’s return awaits the recognition by all Israel, upon whom a hardening has come due to their “unbelief” toward Jesus.
here’s what we can say - when the last person who is elect ( be they Jewish or Gentile ) is in the Ark, i.e. Israel, i.e. The Church, i.e. the Body of Christ, then the end of the world will come and it will be the day of the Lord ( Judgement Day ). so all Israel will be saved.