You are right Mr Vinod, WL tickets, confirmed before charting -- in this case berth numbers are not available. Berth numbers alotted while charting In you case, as the scheduled departure is 19:05, charting is expected between 3:00 PM and 5:00 PM. You can check the berth number online also, after charting is done.
Happy journey and please do come back and share your travel experience with all of us.
Regards