Behold, the farmer waits for the precious fruit of the earth. . . . You also be patient . Jesus assured his listeners that even in spite of outward appearances, impatience was not called for. Like the Mustard Seed which follows, this is a parable of contrast. Once he has sown the seed, the farmer simply waits for the harvest.
Life proceeds as usual.
Anxious concern, impatience, even doubts, do not affect the orderly, unceasing growth. But when the grain is ripe . . . Though he was following a passive, non-political program as Messiah, the Kingdom was nevertheless its inevitable goal. Finally, this may suggest the proleptic nature of the Kingdom. But the Kingdom is only fully to be realized at the harvest, the parousia.