QR crew have multiple copies of the passenger lists for their relevant cabin - if you pop into the galley mid-flight, you'll see it stuck up on one of the walls! On the sheets, you'll see your relevant OneWorld status.
The crew are told to greet QRPC Platinum, Gold and Silver, as well as OWE by name. It should be done prior to the first meal being served, but if on a night-flight, it is sometimes done just before landing.
M