Romans 11:25-26
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
27 For this is my covenant unto them, when I shall take away their sins.
I'm assuming you are referring to the expression, "the fulness of the gentiles?"
This does not mean, "all who will be saved of the gentiles", rather, it means the filling up of the gentiles, or, all the gentiles that fit to fill. This does not prohibit that gentiles will be saved in other times. Before the gospel was sent to the gentiles, gentiles were still being saved. And after the gospel was sent to the gentiles, hardness in part happened to Israel, and some Jews were likewise saved.
Interpreting this passage as the completion of the gentiles beginning the ingrafting again of Israel is a despensational view, naturally. And we know that God's message within that dispensation applies to those of that dispensation. So that the Jews are told to offer sacrifices and we are not. Sacrifices will again be offered, but in a different dispensation to come.
The fulness of the gentiles would seem to me to be something for the current dispensational time, that is, the fulness of the gentiles in this age of grace, just to pick a popular name. I don't really name disensations myself, more just to identify the message and the people.
Regardless of your rapture timing view, there is the matter of the judgment of the nations, the sheep and the goats. They are judged according to how they acted regarding the Jews, Jesus' brothers. Some are declared righteous, these from among gentiles. Whether the church is raptured pre-trib, or pre-wrath, these are after.
Well, let me ask you . . . Do you believe that Matthew 24:31, the gathering of the elect, that this all Christians, and all Israel, all gathered together?
Much love!