To review, if the New Moon (in Jerusalem) of September 17, 2020 is the beginning of the final Festival of Trumpets, then adding 2550 days (per Daniel 12) arrives at a concluding date of September 11, 2027 for the Great Tribulation (or Daniel's 70th week). This would then be the final Day of Atonement, and the Second Coming of Jesus Christ. The interval division of these 2550 days is debatable, but there is considerable evidence to suggest that the Final Jubilee observance determines those divisions. For example, the researchers at Torah Calendar agree that a jubilee observance occurs in the year 2020 (although their timing differs by one day):
A jubilee observance extends the Festival of Trumpets through the 10 "days of awe", and the final shofar blast then occurs on what would usually be the Day of Atonement. In a sense, the Day of Atonement is temporarily suspended during the jubilee observance. This makes perfect sense if Daniel's 70th week is the Final Jubilee (extended 7 times per the punishments of Leviticus 26). This is consistent with the Leviticus 12 laws regarding birth of a male child, and permits sequential fulfillment of the Festival of Trumpets, Day of Atonement, and Festival of Tabernacles.
So is "the time that the daily sacrifice is abolished" of Daniel 12:11 a veiled reference to the beginning of the Final Jubilee? Time will tell, but if this is the case we should expect the ministry of the two witnesses of Revelation 11 to begin within 30 days (NIV):
"And I will appoint my two witnesses, and they will prophesy for 1,260 days, clothed in sackcloth. 4 They are 'the two olive trees' and the two lampstands, and 'they stand before the Lord of the earth.' 5 If anyone tries to harm them, fire comes from their mouths and devours their enemies. This is how anyone who wants to harm them must die. 6 They have power to shut up the heavens so that it will not rain during the time they are prophesying; and they have power to turn the waters into blood and to strike the earth with every kind of plague as often as they want. 7 Now when they have finished their testimony, the beast that comes up from the Abyss will attack them, and overpower and kill them."
Our prospective timeline then is:
9/17/2020 - Beginning of final Festival of Trumpets
+ 9-10 days
9/26-27/2020 - Beginning of Final Jubilee
+ 30 days
10/26-27/2020 - Beginning of Two Witnesses ministry
+ 1260 days
4/8-9/2024 - Abomination of Desolation, death of Two Witnesses, and second Great American Eclipse
+ 1250 days (shortened by 10 days per Matthew 24:22 due to the Final Jubilee)
9/10-11/2027 - final Day of Atonement and Second Coming of Jesus Christ
+ 75 days
11/24-25/2027 - rededication of the defiled Third Temple, and first Festival of Tabernacles of the millennial reign of Jesus Christ
The timing of the Harvest of the Church remains a mystery, but if the above timeline holds true, we should expect the arrival of the Two Witnesses by October 27th.