When was the whole plan put together?
The whole plan of redemption was put together in eternity past, before creation. The whole Godhead assembled it, and the basis for doing so was foreknowledge. The crucifixion itself was in the predeterminate counsel of God, so this plan predates human history.
Les explains that way back in eternity past, the Godhead put the whole plan together. The reason they could put it together was foreknowledge. He also points out that the crucifixion was in the predeterminate counsel of God, and the whole Godhead is involved in this tremendous work of redemption. He connects this to 1 Peter, where Peter writes to the elect Jews in the dispersion, chosen according to foreknowledge, not predestination. Les emphasizes that this makes all the difference in the world.