Boaz is a type of Jesus Christ. Boaz' actions toward Ruth give us insight into the character of our Savior, particularly in His office of Judge.
Biblically, a harvest represents the gathering and resurrection of the saints, but also includes other aspects of our preparation for God's Kingdom.
God employs a winnowing process in selecting those who will enter the Millennium. The process includes punishment for Israel's failure to serve as priests.
Prophecy shows God scattering His people for their sins. It appears He will scatter them into small fragments, perhaps even down to individuals alone.
The name of Boaz (a type of Christ) appears many times more than Ruth (a type of the church), indicating Christ's intense work on behalf of the church.