The studies which demonstrated an increase in force production from Alpha-GPC did so on an empty stomach, 90 minutes before training.
Whether this means that 90 minutes is optimal has not been decided. It might work better at 30 minuted pre-workout, maybe its better yet 120 minutes pre-workout.
If you want to follow the protocol, you need to take it upon waking, probably 20 minutes or so before food and 90 minutes before training.
If you find it works for you outside of this protocol, then do that
If you don't know if its working for you or not, because you haven't trained hard or long enough to be sure of what your 1RM is / how your body feels, then you don't need to take this supplement.