SATURDAY AM UPDATE: At the top of the Friday box office is WB's Aquaman, pulling in an estimated $17.1 million, giving it a good shot at reaching $50 million for the three-day, pushing its cume over $185 million by the end of the weekend. Internationally, the film brought in an estimated $18.4 million from 78 markets on Friday, taking the international cume to $511.8 million for a worldwide tally topping $666 million. In second place, Disney's Mary Poppins Returns is starting to show it...