Congratulations! You are now the Product Owner on an Agile project. Maybe your boss gave you the role, or perhaps you’re working with an agile agency and you volunteered after learning a little about it. Either way, now you have a problem: people are already asking you "When will the product be ready?"
It doesn't matter if it's your boss wanting to know when you will deliver the product, or if it's your customers wanting to know when they can use shiny new features, or even if it's the voice in the back of your mind wondering when you can ship the Next Big Thing. Someone wants to know.