Current status
An iOS project exists in the mobile app, but there is no public TestFlight or App Store link yet.
iPhone Build
The iOS channel is scaffolded, but not published yet.
The mobile app already contains an iOS project. What remains is building the IPA and shipping it through TestFlight or the App Store.
Next step
Build the IPA on macOS/Xcode, then publish through App Store Connect or TestFlight.
After publishing
A direct iPhone download/store button will be added to both download pages.