וְעָשִׂ֣יתִי אֹ֠תָם לְג֨וֹי אֶחָ֤ד בָּאָ֙רֶץ֙ בְּהָרֵ֣י יִשְׂרָאֵ֔ל וּמֶ֧לֶךְ אֶחָ֛ד יִֽהְיֶ֥ה לְכֻלָּ֖ם לְמֶ֑לֶךְ וְלֹ֤א יהיה־[יִֽהְיוּ־] עוֹד֙ לִשְׁנֵ֣י גוֹיִ֔ם וְלֹ֨א יֵחָ֥צוּ ע֛וֹד לִשְׁתֵּ֥י מַמְלָכ֖וֹת עֽוֹד׃
and I will make them one nation in the land, upon the mountains of Israel, and one king shall be king to them all; and they shall be no more two nations, neither shall they be divided into two kingdoms any more at all;
Zohar
Some have prevailed in this world, and all will prevail at the advent of King Messiah, when Yisrael will be "one nation in the land" (Ezekiel 37:22), one nation before the Holy One, blessed be He. This is the meaning of the verse "and I will make them one nation in the land," and they will reign above and below, as it is written, "and, behold, one like a son of man came with the clouds of heaven" (Daniel 7:13). This is King Messiah, as it is written, "And in the days of these kings shall the Elohim of heaven set up a kingdom..." (Daniel 2:44). Therefore, Jacob wanted his blessings to be postponed and did not take them at once.