TODAY 3rd Hour: Final preps for King Charles’ coronation. Exclusive look at King’s Highgrove estate. Steve Kornacki’s Derby breakdown. Melinda French Gates’ new mission to empower women.

<p>Prince William and Princess Kate make a public appearance ahead of the royal celebration. Also, an exclusive tour of King Charles’ private estate. Plus, Steve Kornacki breaks down the odds and field of horses coming up at the 149th running of the Kentucky Derby tomorrow. And, learn about Melinda French Gates’ new endeavor: a new publishing imprint that highlights authors pushing for equality.</p>