Well the main issue is that no one knows the time of Christ Second Coming, but once it happens then He takes the saints to heaven and they lived and reign there 'with Christ a thousand years', after which the New Jerusalem comes down as we see in Revelation 21:2, and the wicked meet their end.
Revelation 21:2
And I John saw the holy city,
new Jerusalem,
coming down from God out of heaven, prepared as a bride adorned for her husband.
The clue here is the 'last enemy that shall be destroyed is death' which happens when the New Jerusalem comes down out of heaven and the wicked are destroyed and we see it in Revelation 21:4...
Revelation 21:4
And God shall wipe away all tears from their eyes; and
there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain:
for the former things are passed away.
The coming down of the New Jerusalem is the clue of when the wicked meet their end as
Revelation 20:9 tells us that after the 1000 years when they 'compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them.'
At this point you will see the implementation of 'when all things shall be subdued unto him', as we see in the next part and the description..
Revelation 21:5
5 And
he that sat upon the throne said,
Behold, I make all things new. And he said unto me, Write: for these words are true and faithful
.6 6 And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.
We see now the angels description of the kingdom in the New Jerusalem that has come down out of heaven..
Revelation 21:9-22
9 And there came unto me one of the seven angels which had the seven vials full of the seven last plagues, and talked with me, saying, Come hither, I will shew thee the bride, the Lamb's wife.
10 And he carried me away in the spirit to a great and high mountain, and shewed me that great city, the holy Jerusalem, descending out of heaven from God,
11 Having the glory of God: and her light was like unto a stone most precious, even like a jasper stone, clear as crystal;
12 And had a wall great and high, and had twelve gates, and at the gates twelve angels, and names written thereon, which are the names of the twelve tribes of the children of Israel:
13 On the east three gates; on the north three gates; on the south three gates; and on the west three gates.
14 And the wall of the city had twelve foundations, and in them the names of the twelve apostles of the Lamb.
15 And he that talked with me had a golden reed to measure the city, and the gates thereof, and the wall thereof.
16 And the city lieth foursquare, and the length is as large as the breadth: and he measured the city with the reed, twelve thousand furlongs. The length and the breadth and the height of it are equal.
17 And he measured the wall thereof, an hundred and forty and four cubits, according to the measure of a man, that is, of the angel.
18 And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass.
19 And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;
20 The fifth, sardonyx; the sixth, sardius; the seventh, chrysolyte; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst.
21 And the twelve gates were twelve pearls: every several gate was of one pearl: and the street of the city was pure gold, as it were transparent glass.
22 And I saw no temple therein: for the Lord God Almighty and the Lamb are the temple of it.
And the saints ' they which are written in the Lamb's book of life', who will live there for eternity...
Revelation 21:24-27
24 And the nations of them which are saved shall walk in the light of it: and the kings of the earth do bring their glory and honour into it.
25 And the gates of it shall not be shut at all by day: for there shall be no night there.
26 And they shall bring the glory and honour of the nations into it.
27 And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life.