When Did God Become Man?

God became Man in the Incarnation, but the Incarnation seems to have been ordained from the foundation of the world. There is scripture to suggest that God the Son became man in some sense even back in the Old Testament. The Christ-centered model for early Genesis can make sense of this paradox.

Link to Amazon page of Early Genesis the Revealed Cosmology.
https://www.amazon.com/dp/B06XRLDYJB