I would never take whey protein as a "meal replacement". Whey creates a massive insulin spike, one that is greater than white bread. This, of course, is why it's so widely used as post-workout nutrition. Even if the body builders don't know why, the reason why whey is so effective IS the massive insulin spike. Your muscles are most insulin sensitive immediately following a heavy weight workout, and whey is the most effective protein to quickly shuttle amino acids to muscles for growth, repair and recovery. If you're just waking up and drinking whey, you're not doing anything but spiking your insulin for no reason. You'd be much better off eating that protein in the form of whole food instead of drinking it. Something like eggs or steak will stay with you for hours, spike your insulin more slowly and provide additional nutrition instead of just "empty protein". Hell, I'm against "meal replacement" shakes all around. If you're that much in a hurry, I'd rather go for a Larabar or something.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.