From personal experience, I would endorse the above advice. I'm all for being honest, but organizations are strange beasts, and I once got fired for something j

From personal experience, I would endorse the above advice. I'm all for being honest, but organizations are strange beasts, and I once got fired for something just like this. As long as you are sure you will eventually succeed, ignore the problem and keep going. Being late is no big deal; it's actually a confirmation of how amazing and innovative your product is. If someone senior brings up the issue, don't flinch, and be ready with an alternative timeline.