Currently only delegated user permissions are supported, and this is very sub-optimal for bots and service applications that need to monitor Teams presence of users.
It appears that there is now an Application level presence permission, Presence.ReadWrite.All.
Unfortunately, it can't be used to actually read presence, only write presence status...
Ideally, one would use the change notification webhook model (https://docs.microsoft.com/en-us/graph/webhooks#firewall-configuration) to subscribe to presence changes, but that's really not workable when Delegated permissions are the only option for getting presence information.