Some resorts are excellent about contacting you prior to your stay, while other resorts are horrid (my upcoming concierge stay is, sadly, the latter).
If I were you, I would determine what PS reservations you wanted and then place a call to relay that information to the concierge. Once they have notified you that they have booked those reservations for you, please follow up and verify that they have really done so. I have been burned far too many times with certain concierge stays, and I have always placed my own calls to WDW-DINE in order to find out EXACTLY what was and what was not booked for me. I cannot tell you how many errors I have found with the reservations that the concierge had made for me. With the wonderful help of the WDW-DINE folks, I was able to correct all the mistakes. But that was because I did my "verification" phone call well in advance of my arrival. Had I waited until the end, I probably would not have been able to salvage most of those reservations. So, please, if you have any really important PS reservations (like Cinderella's breakfast or any of children's activities at the GF), verify yourself that they have been made properly (those events usually sell out well in advance of your vacation).
By the way, for the past few years, I have been making my own PS reservations via the WDW-DINE phone line. I do that for both non-concierge and concierge stays. Its better to be safe than sorry.