A couple other things you might want to consider, if affordable for you. Assuming that your 12:00 workout is a weight-training workout (rather than conditioning or cardio), then you would probably benefit from having one dose of Plazma before it. You could take the Plazma along with the Indigo at 11:30 or take the Plazma separately around 11:45, if that is convenient.
In my experience either way works well. In addition, if you don’t want to or can’t eat a small meal around 4:30 or 5:00, as Robstein suggests, a good (maybe even better depending on your goals) alternative would be a MAG-10 pulse around that time. Good luck!