When did Abraham see Jesus' day?
When God provided the sacrifice in the form of ram to keep Abraham from sacrificing his son Isaac. The parallels between God and Jesus and Abraham and Isaac are striking, in both cases God provided the sacrifice.
"By faith Abraham, when he was called to go out into a place which he should after receive for an inheritance, obeyed; and he went out, not knowing whither he went. By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles with Isaac and Jacob, the heirs with him of the same promise: For he looked for a city which hath foundations, whose builder and maker is God. Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised. Therefore sprang there even of one, and him as good as dead, so many as the stars of the sky in multitude, and as the sand which is by the sea shore innumerable. These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them, and confessed that they were strangers and pilgrims on the earth" (Hebrews 11:8-13).
God is present at every infinitesimal point in space-time.
God is in the future and the past simultaneously and in every point of physical existence.
God sees everything before we see it happen. God sees everything at once, all of the past, all of the future.
Abraham is in God’s realm and sees what God sees. Abraham’s seed was chosen to bring forth God in the flesh. When God was brought out into flesh, God saw this before it happened, and so did Abraham.