Time is a measure of movement, hence of becoming. Why is there becoming? Because every potential being is entirely relative to a being in act which it is attracted to, and that it is through becoming that being in potency meets being in act.
Therefore, not only being in potency is not being, rather a modality of being, the most tenuous at that, it is not anymore becoming. However, it is through becoming that being in potency attains its end by joining being in act.
It follows that being in act is anterior to being in potency from the point of view of perfection, which is the inverse of the (genetic) viewpoint of becoming, where being in potency precedes being in act.
I thus conclude that being is anterior to becoming, and that becoming only exists through being, which manifests itself through the present moment, since only the present moment exists, for neither the past nor the future exist.
The present moment is the victory of Act over Potency, thus of Being over Becoming... an ephemeral victory at that.