The short answer is that yes, The Finals is coming to Xbox at some stage. The team at Embark Studios has announced this game as a current-gen console and PC release, with an Xbox Series X|S version firmly in its plans.
The Finals doesn't have a solid release date yet on any platform, although it seems to be aiming for a broad 2023 release. For now, we'll have to await more information from the team on an Xbox release date.