Wrong.
Nowhere in the Bible is there anything about a coming millennium.
You're just as wrong as the Darby followers.
Again, nowhere in the Bible is there a "millennium".
Secondly, there aren't stages of salvation.
The millennium is the thousand year reign of the overcomer saints over the nations left after the wrath of God in the vials is poured out.
It is when The lord reigns from sea to sea and men learn war no more.
It is after the Lord returns from Heaven to earth and resurrects the worthy saints from the graves.
It is described in Psalm 72.
Psa 72:1 A Psalm for Solomon. Give the king thy judgments, O God, and thy righteousness unto the king's son.
Psa 72:2 He shall judge thy people with righteousness, and thy poor with judgment.
Psa 72:3 The mountains shall bring peace to the people, and the little hills, by righteousness.
Psa 72:4 He shall judge the poor of the people, he shall save the children of the needy, and shall break in pieces the oppressor.
Psa 72:5 They shall fear thee as long as the sun and moon endure, throughout all generations.
Psa 72:6 He shall come down like rain upon the mown grass: as showers that water the earth.
Psa 72:7 In his days shall the righteous flourish; and abundance of peace so long as the moon endureth.
Psa 72:8 He shall have dominion also from sea to sea, and from the river unto the ends of the earth.
Psa 72:9 They that dwell in the wilderness shall bow before him; and his enemies shall lick the dust.
Psa 72:10 The kings of Tarshish and of the isles shall bring presents: the kings of Sheba and Seba shall offer gifts.
Psa 72:11 Yea, all kings shall fall down before him: all nations shall serve him.
Psa 72:12 For he shall deliver the needy when he crieth; the poor also, and him that hath no helper.
Psa 72:13 He shall spare the poor and needy, and shall save the souls of the needy.
Psa 72:14 He shall redeem their soul from deceit and violence: and precious shall their blood be in his sight.
Psa 72:15 And he shall live, and to him shall be given of the gold of Sheba: prayer also shall be made for him continually; and daily shall he be praised.
Psa 72:16 There shall be an handful of corn in the earth upon the top of the mountains; the fruit thereof shall shake like Lebanon: and they of the city shall flourish like grass of the earth.
Psa 72:17 His name shall endure for ever: his name shall be continued as long as the sun: and men shall be blessed in him: all nations shall call him blessed.
Psa 72:18 Blessed be the LORD God, the God of Israel, who only doeth wondrous things.
Psa 72:19 And blessed be his glorious name for ever: and let the whole earth be filled with his glory; Amen, and Amen.
Psa 72:20 The prayers of David the son of Jesse are ended.
Blind men have never seen it, and unworthy men will not enter it to reign.
LA