1) Cf. Church Teaching Re: rapture. [Cf. CCC 676].
2) They are Jews whose conversion is awaited so that the Church achieves “the measure of the stature of the fullness of Christ” [cf. CCC 674] and there are those who say that they are Jews and are not, but are a synagogue of Satan [cf. Rv 2:9 (RSVCE)].
3) Israel now is an imposter Israel and it is the work of the latter Jews in 2) above.