Once your core reaches an MVP state where feedback can be gathered from, you should launch to kick start this Incremental, iterative process.
Reference
Fried, Jason, and David Heinemeier Hansson. Rework. 1st ed, Crown Business, 2010.
Highlights or timestamps
Once your core is ready, launch immediately. Don’t wait for every aspect of the business to be fully complete. You can work out the details later.
— ^a6cd4d from Rework