I personally wouldn't expect any Vega stock til the end of August, and the custom models a month after that. Polaris had the same kind of schedule.
Polaris had a release date of the 29th of June and there was stock at launch. The custom cards arrived in August. No different from the Pascal launch really, Founders edition available at launch but people were waiting a while for custom cards.
Not saying you are wrong with Vega. Will have to wait and see, only 5 days now.