When did the luggage were collected before the Titanic's departure?



Hello everyone!
Not sure it's the proper section to ask this question so I'm sorry if it's not correct.

My question is : do we know at what moment the passengers were invited to drop their luggage before the Titanic's departure? If the boat has left Southampton at 12:30 I presume the luggage must have been charged way before. But when exactly? early in the morning of the 10th April or even the previous evening?

Thank you very much for your help :)