From what I understand about starters, you should feed them immediately when you use them and weekly otherwise. So I would think you could feed it now, let it sit overnight to work, make your rolls/bread and then either feed it again right away or wait until Thursday. Feeding it now and using the next day, it might not have quite the flavor you had before but it will still be good!
Doc, I'm pretty sure that one should not feed too much of that bread, 'Cause the doe once it hits your stomach it adheres to your stomach liner and developes a stomach ache and if that wasn't enough it takes a long time leaving your intestines and would blow you up with the quickness. Hope this would change your mind.