I called a couple weeks ago, and they were pretty useless. Put me on hold for 5-10 minutes at a time after I gave them a new piece of info (it was a 45-minute call). Couldn't give me any actual info. Told me a handful of entry criteria for receiving OTA updates. That's it.
My purchase date is very close to yours (same truck/trim!), and I also have yet to receive any updates. Glad(?) I'm not the only one. This. Is. Maddening.