This feature is only available on a "small part" of users' computers at the moment, so it may take a week or more to see it. And as it is fast ring, you should not be surprised if there are any bugs.
There are other reasons to consider publishing, at least. The Screen Feature Your phone now works with a larger number of Surface devices, ranging up to newer hardware such as Surface Pro 6 and Surface Laptop 2. You can also quickly create event-related events. Calendar from the taskbar. As long as you are ready to face problems, this could be a significant glimpse of the direction that Windows will take in the near future.