Question

who is the lord of the harvest? who is being praised here?

Answer 1

Typically a harvest is the spiritual parallel to what, in our time, we know as a “revival,” although I personally feel that there is a distinction between revival and harvest. I feel that revival has more to do with the spiritual condition of the church. The Old Testament harvests can be likened to the fields of humanity that are to be reaped into the kingdom in the end times, mentioned in the New Testament. Through the centuries, significant moves of God have caused masses of lost and purposeless souls to be saved. These revival harvests are the enormous yields of fruit produced from the seed sown and toil invested in a nation or area.

From the time that Jesus walked the earth to now, we have been commissioned to bring in the great spiritual harvest of souls for His kingdom. Although God’s enemies are still standing by trying to thwart the purposes of God and to steal the harvest right out of our hands, we can’t forget that He who is with us is greater than those who are against us. 
God has a plan and God has provision.

Answer 2

The harvester is gods domain.
He is the harvest and he say in his words that peoples are ready and hungry to hear about him.