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.
Keep looking for the setting, the Sentry feature is actively being released as we speak and it should show up in no time. Over the past couple of days, 1 person has already gotten the beta test version per Teslafi!