Potentiality and Actuality are contingent on cause/effect duration etc...
Reality isn't. it is what it ii, it is when it is, it is why it is.
The Past: All past events are now actuality, but we can remember and envisage the causes of effects, we can look at the past as potentiality giving way to actuality so we can revise it. I guess this is where Hume's cause & effect learning via uniformity happens; we know that when we ate that bread it caused the effect of human nourishment, and we can apply the same principle to objects of the same uniform, i.e. bread and milk.
The Now: The application and recognition of potentiality by creating the conditions necessary for actuality. A bit of both wouldn't you say?