I think God is very intentional in the Bible with Judgment pictures.
To me, Barley is a picture of the Rapture, as it only needs to be waved to separate the grain from the husk. For example, in Ruth 3:20, Boaz is winnowing barley: tossing grain into the air to finish separating the grain from the chaff. I think this is a picture of those will be Raptured (believers in Jesus).
Wheat needs to be threshed with a sledge to separate grain from chaff, and I think this is a picture of the Tribulation: God’s Wrath to bring people to Christ and Salvation. The Hebrew word for wheat is חִטָּה (pronounced “chittaw”), which has a Gematria (numerical) value of 22: how cool would it be if the Rapture and beginning of the Tribulation were in 2022?!
For those who reject Christ, He will trample on them like Grapes, and juice/blood pours out.
I had a dream a few years ago wherein I was at the corner of a street called “Wheatfield”, and I understood in my spirit this was indicating that we are about to turn the corner into the Tribulation. Of course, no one knows when, but the signs have continued since that dream!