The Ending and the New Beginning.

For your perusal and consideration: What is the future of mankind?

Adam was created on the sixth day - thus he was born on day 5 of the Creation (Bible)
Adam sinned in the first 5-1/2 days (actual days for he only lived 930 years). (Sacred literature)
From his death to his return to the Garden (Heaven)  is 5-1/2 days or using one day as a thousand years, 5500 years (Sacred literature)

Neglecting the insignificant days, then for the duration of God's promise (to Adam's resurrection - return to the Garden)  is 5500 years.

Figuring that 5500 was from his death until his resurrection, add 930 years to the 5500.
That would place the General Resurrection (the rapture) at 6430 years from the Creation.
Most theologians place the age of the earth at around 6000 years using various techniques. The Masoretic Text should be the most accurate since it is God's Word.
Thus, in approximately 430 years Jesus's should be his second coming. It won't be that year and the day is certainly unknown because we can only use rough calculations. (I'm not setting dates but only dating God's promise to Adam).
Genesis says that God worked on six days, and rested on the seventh. In our time, God "worked" by keeping the world safe for 6000 years. That's about now! we are as in the days of Noah.
God's "Sabbath" is surely when Jesus reigns 1000 years (His rest), or one sacred day.
As time passes the general resurrection and the 7-1/2 years of tribulation will occur. Adam will live again as God promised (sacred literature).
The Thousand-year reign comes next. (Dr. David Jeremiah's "The Revelation Prophecy Chart). This is God's rest on the seventh "day". He no longer needs to "work" with the world because it will be a time of peace. . After that is Judgment Day, and a new heaven and new earth. At that time the eighth day commences, and never ends. Before the first day there was no time, and on the eighth day neither is there time.
The beginning of the eighth day would be about 8000 A.M., or 4000 A.D. By then I will have been in Heaven for almost 2000 years! At that time, I will return "home" along with the New Jerusalem. Adam will too.