Installing apps from command line (occ app:install)

Did occ app:install make it into Nextcloud 19?

I can see it committed in the master Git repository but it doesn’t seem to work, and nor can I find it in the Nextcloud occ documentation.

Am I missing something obvious?

php occ list:

 app
  app:check-code                      check code to be compliant
  app:disable                         disable an app
  app:enable                          enable an app
  app:getpath                         Get an absolute path to the app directory
  app:install                         install an app
  app:list                            List all available apps
  app:remove                          remove an app
  app:update                          update an app or all apps

looks like it. It also shows in the documentation (without further explanation):
https://docs.nextcloud.com/server/19/admin_manual/configuration_server/occ_command.html#apps-commands-label