Understanding Concepts of Time

So Fiona's made another conceptual leap: this morning she announced to her parents "I played snow yesterday." I believe this is the first time she's spoken about "yesterday", and it follows only a week or so after she correctly used "maybe".

I suppose it's still too much for a parent of an impatient two year old to ask when she's going to understand the concept of "soon" ( we still seem to be stuck in the polarity of "right now" and "never").