When will Austin, TX Mapping be Available?

Good to hear you plan an experience around the Apple store 🍏. Location anchors are currently only available in 5 areas (Bay Area, LA, New York, Chicago, Miami). We are working on bringing more cities online. Please observe the developer documentation for updates on supported cities:
https://developer.apple.com/documentation/arkit/argeotrackingconfiguration/3571351-checkavailability

What’s included within Bay Area coverage?

For a fine grained availability checks you can use:
https://developer.apple.com/documentation/arkit/argeotrackingconfiguration/3571350-checkavailability
You can query for any GPS location where you plan to create your AR experience.