If you just confirmed last night then I'd give it a week or so, and if you haven't heard from your Owner Advisor by then you should follow-up. Mine e-mailed me within a couple days of confirming.
Mine took about 6 weeks to get back to me, but I'm still a month out from delivery, so the time frames may be slower not that there is more of a delivery backlog.
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I forgot to add: delivery date September 15th
Me too! I'm also in Texas, and will be picking mine up at the Dallas location. I assume you'll be at the Austin location, but our cars are likely to share the same delivery truck.