There must be, I think, some connection between the parable of the sower in Luke 8 and the harvest Jesus talks about at the beginning of Luke 10. Jesus has been sowing the seed of the word of God, and some has begun to grow up. The harvest is ripe, and it’s time to send laborers out to harvest. The harvest is connected (in Luke 10) with a judgment, in which the grain will be gathered up and the chaff destroyed. And this points also to the harvests performed in Revelation 14. Something like that at least seems to be going on.