I'm in UK and have had it installed. Updates aren't rolled on a region specific basis, Oculus have advised of this is multiple threads on this forum. It's an app that appears in my library, it can't be uninstalled like apps / games that have been purchased.
I have update 13 installed on my quest and this app isnt there. Its also not on the store so you cant even go get it. The roll out of these "features" is silly why not allow people who have a PC to allow them to update through the PC oculus app when you connect using oculus link. At least then the people with a PC could update through that and it should free up the servers for the direct quest updates for people without a pc.