How does it work when you earn status during your trip ?

I'll be leaving on a DONE4 soon, and will gain BA silver status during the main part of the trip. Will I have the silver benefits if I have silver status, but not the card yet ? (This will be mainly for international lounge access in australia for dometic flights, and lounge access for my cheap LHR-AMS ticket home).

Currently BA haven't even send me my blue card yet, so I might not even have anything to prove my EC membership...