The problem is, all here think that God does all the doing in material reality by himself. But he cannot change, so he cannot do anything in material reality without it being suddenly eternal with him.
Augustine, in The Confessions, answers how God actually creates in temporal reality when you read the discussion of the first phrases of the Book of Genesis:
“In the beginning” is a location, it is not a Time (it is not written “at the time of the beginning”).
“Let there be…” is a contemplative knowing by a contingent creature coming to understand in a temporal knowing that matches the Eternal knowing of God, and when the two know together, the contingent creature (Angel of the LORD) and God know together, then material creation happens in its temporal stream - all that God does temporarily is done in co-operation with a temporal creature (that is why we pray and ask things from God, we ask so that our knowing is equal to his knowing. He knows nothing alone except his Son. Everything else he knows is a ‘together knowing’. Otherwise it does not happen.)
Our LORD knows everything eternally, but knows it happening when there is a temporal creature knowing with him. Thus he knew eternally me typing this response, yet this response did not exist eternally in the temporal flow, but began to appear in the temporal stream when He and I together knew me typing. And here it is, our co-operative answer to show that God is not Temporal but does all he does with someone who is temporal, thus his eternal doing only appears when his Co-Operator is also operating.
Thank you, St. Augustine and St. Thomas! Continue to pray for us!