You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
Update on this: I applied May 23 (when we bought our Model Y) and was approved for the standard (not Charge Ahead) rebate today, October 2. Apparently check comes in the mail in the next 30 days or so. Timeline of 4-5 months at the moment, then.