What's Next for the iPhone XR
iOS 13.3 was the last known update in Apple's iOS 13 pipeline which means we don't have a good read on what's coming next.
Apple is almost certainly working on a new version of iOS 13 (probably iOS 13.3.1 or iOS 13.4 or both), but we don't expect either one to roll out in 2019.
With the year winding down and the holidays coming up, we'd be surprised if Apple pushed new firmware to the iPhone before the end of the year.
That said, you can expect the company to roll out new iOS 13 firmware in early and mid-2020 as we push toward the release of iOS 14.