What did the man mean when he said he had finished harvesting the grain?

This means that the grain is ripe and should be taken home. It is called the harvest season. For example, migrant workers from rural areas in Shaanxi go to xi 'an to work. Every time the wheat is ripe, they say they will go home to collect the wheat, which is actually to collect the grain. Secondly, it means buying grain. For example, whenever rice or wheat is harvested, grain merchants will drive to the village to buy grain, which is also called grain harvesting.