I certainly agree with you regarding God's timelessness - that all that has and will occur in Creation is in the eternal 'now' for Him. But, as you mentioned elsewhere, God knows all counterfactuals:
1 Samuel 23:7-13
Saul was told that David had gone to Keilah, and he said, “God has delivered him into my hands, for David has imprisoned himself by entering a town with gates and bars.” And Saul called up all his forces for battle, to go down to Keilah to besiege David and his men.
When David learned that Saul was plotting against him, he said to Abiathar the priest, “Bring the ephod.” David said, “Lord, God of Israel, your servant has heard definitely that Saul plans to come to Keilah and destroy the town on account of me. Will the citizens of Keilah surrender me to him? Will Saul come down, as your servant has heard? Lord, God of Israel, tell your servant.”
And the Lord said, “He will.”
Again David asked, “Will the citizens of Keilah surrender me and my men to Saul?”
And the Lord said, “They will.”
So David and his men, about six hundred in number, left Keilah and kept moving from place to place. When Saul was told that David had escaped from Keilah, he did not go there.
The citizens of Keilah surrendering David to Saul never occurred - nonetheless God new it would have been so. We may speculate as to reasons for such omniscience.