God’s plan has never changed. It existed in eternity and before time as we know it. Eternity was, is and always will be. God was, God is and God ever more will be. He knew our finite, human minds would be unable to grasp and understand eternity and endless space. So, He spoke the earth into existence somewhere in space and some time in eternity. By doing so, He divided space and time into small chunks of universes and days. This allowed humans to have something finite that we could grasp and understand. This is wisdom beyond our understanding. Then He created us and breathed life into us. Then we rebelled against God by doubting His love and provisions for us. This was no surprise to Him. He had already made provision to redeem us before we ever fell. The how and the when was a mystery until Jesus came and died for us on the Cross. It was prophesied over and over throughout history but people refused to see and /or believe. Had satan and his demons understood the plan and the time, they would not have crucified Jesus on the Cross. But God was, is and always will be in control. Jesus helped to design the plan of salvation and He finished it at Calvary.
2 looking unto Jesus, the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God.–Hebrews 12:2 NKJV