Throughout Tanach, "Hashem's vineyard" (see Isaiah 5:7, for example) is a metaphor for the Land of Israel and the vines symbolize the Jewish People. On the Sabbath, we sing the ancient "Dror Yikra" sonnet that was composed over a thousand years ago by Donash ben Labert from Spain, where he alludes to a prophecy in Jeremiah 2:21 when Hashem promises that He will replant the "cuttings" - those who have been cut off from their ancient homeland - in His vineyard. As such, the flourishing vineyards in the Land of Israel are a clear sign of the imminent redemption and ingathering of the exiles, as is we see today with our own eyes.