For future reference, you should be able to see "Elite: Dangerous - Mercenary Edition" in the "My Downloadable Products" section.
I ordered a copy for my brother and although the order still says "Pre-order processing" the download is available.
It is there but is not a working link and says "Coming" and "Processing"- hopefully frontier gets this fixed ASAP this morning, if I didn't come to the forums and realized I had to download the Demo (Palm to Face) to get my copy I'd be pretty upset right now..