Your DS would be the best contact for latest status on your delivery. My profile for example was not showing the free supercharger for quite some time after purchase, but DS has clarified that it can take some time to refresh. It eventually did.
I have asked for a quote from the electrician(s) recommended by Tesla in DFW area. The cheapest quote came to 900 dollars for the installation (excluding HPWC). I asked around and it should cost no more than 200-300 bucks for qualified electrician to perform an installation, unless you have extremely long cable runs or obstructed access to the panel. I already had NEMA14-30 in the garage and that is what I use for now. MIght revisit either 14-50 or HPWC when I am closer to getting 2nd car (Model 3).