Not it's not, it's reality.
To you, today's tongues are real because you think it was a promise and it is observably practiced many including yourself.
Well, not quite so, raising the dead and other miracles were also a promise but to the disciples and Apostles only coz we see non of them today.
Yes, it is harvest time:
Rev 14:
13Then I heard a voice from heaven say, “Write this: Blessed are the dead who die in the Lord from now on.”
“Yes,” says the Spirit, “they will rest from their labor, for their deeds will follow them.”
14I looked, and there before me was a white cloud, and seated on the cloud was one like a son of man
bwith a crown of gold on his head and a sharp sickle in his hand.
15Then another angel came out of the temple and called in a loud voice to him who was sitting on the cloud, “Take your sickle and reap,
because the time to reap has come, for the harvest of the earth is ripe.”
16So he who was seated on the cloud swung his sickle over the earth, and the earth was harvested.
17Another angel came out of the temple in heaven, and he too had a sharp sickle.
18Still another angel, who had charge of the fire, came from the altar and called in a loud voice to him who had the sharp sickle,
“Take your sharp sickle and gather the clusters of grapes from the earth’s vine, because its grapes are ripe.”19The angel swung his sickle on the earth, gathered its grapes and threw them into the great winepress of God’s wrath.
20They were trampled in the winepress outside the city, and blood flowed out of the press, rising as high as the horses’ bridles for a distance of 1,600 stadia.
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When a grape is cut, it doesn't go back to the vine. The era of grapes going back to the vine ended with the real tongues.