[sfem]

Your progress sounds similar to what I had. I am several months farther along than you. Stay with it! You've already had a couple of the milestones that I know brought me happiness. The feeling of something there when you body moves. The hard spots under the nipples. Other milestones for me, although I couldn't pinpoint a day they started include some of these things:

the itchiness of the nipples and surrounding area as they go from puffy to tight
the deeper pains that sometimes happens (sign of deeper growth in my mind)
the visibility of a curve from the bottom of the nipple to the chest (this was a big one mentally for me)
the realization there is no more hiding them
the time when going topless at a family beach is no longer an option
the day that your favourite bra finally fits right
the day you no longer fit into some of your bras
the day your pants feel like they don't fit right anymore, loose at the waist and tight across the butt
when you notice a curve to your profile when you lie on your side
and the best one of all, when your wife says she likes them!

Happy growing!