Isaiah 18:3-7 KJV

³ All ye inhabitants of the world, and dwellers on the earth, see ye, when he lifteth up an ensign on the mountains; and when he bloweth a trumpet, hear ye.

⁴ For so the Lord said unto me, I will take my rest, and I will consider in my dwelling place like a clear heat upon herbs, and like a cloud of dew in the heat of harvest.

⁵ For afore the harvest, when the bud is perfect, and the sour grape is ripening in the flower(So not ripe yet), he shall both cut off the sprigs with pruning hooks, and take away and cut down the branches.( So....Before the harvest ,which would be fall, so before Fall)......when the bud is perfect with the grape ripening!! That would be spring or early summer) I think this alludes to Revelation 14:14-19

 

Revelation 14

¹⁴ And I looked, and behold a white cloud, and upon the cloud one sat like unto the Son of man, having on his head a golden crown, and in his hand a sharp sickle.

¹⁵ And another angel came out of the temple, crying with a loud voice to him that sat on the cloud, Thrust in thy sickle, and reap: for the time is come for thee to reap; for the harvest of the earth is ripe.

¹⁶ And he that sat on the cloud thrust in his sickle on the earth; and the earth was reaped.

¹⁷ And another angel came out of the temple which is in heaven, he also having a sharp sickle.

¹⁸ And another angel came out from the altar, which had power over fire; and cried with a loud cry to him that had the sharp sickle, saying, Thrust in thy sharp sickle, and gather the clusters of the vine of the earth; for her grapes are fully ripe.(Now they are fully ripe)

¹⁹ And the angel thrust in his sickle into the earth, and gathered the vine of the earth, and cast it into the great winepress of the wrath of God.

 

Isaiah 18:6-7

⁶ They shall be left together unto the fowls of the mountains, and to the beasts of the earth: and the fowls shall summer upon them, and all the beasts of the earth shall winter upon them.

( This is a match to Revelation 19:

¹⁷ And I saw an angel standing in the sun; and he cried with a loud voice, saying to all the fowls that fly in the midst of heaven, Come and gather yourselves together unto the supper of the great God;

¹⁸ That ye may eat the flesh of kings, and the flesh of captains, and the flesh of mighty men, and the flesh of horses, and of them that sit on them, and the flesh of all men, both free and bond, both small and great.

Isaiah 18-7......The Millennium, bringing gifts. I believe these are Ethiopians-Egyptians?  

⁷ In that time shall the present be brought unto the Lord of hosts of a people scattered and peeled, and from a people terrible from their beginning hitherto; a nation meted out and trodden under foot, whose land the rivers have spoiled, to the place of the name of the Lord of hosts, the mount Zion.
--
Mercer