When will God fulfill the covenants He made with Israel?
God will fulfill the covenants He made with Israel during the tribulation, the period when He again deals directly with the nation of Israel. Those covenants are Jew only, not church or Gentile, and they will come into fruition in that future time of trembling and fear centered in the Middle East.
Les teaches that the tribulation is primarily God dealing with the nation of Israel. The covenants God made with Israel are Jew only and have nothing to do with the Gentile or the church, so the church cannot be run into God's dealing with His covenant people. Those covenants will finally come into fruition when we get into the tribulation, the time of God dealing with Israel. He connects this to Jeremiah 30:5, where trembling, fear, and not peace are foretold, with horrible events centered in the Middle East and directed primarily to the children of Israel.