By Andrew Gould Dak Prescott is making considerable progress toward his long-awaited return. Per NFL Network’s Jane Slater, Dallas Cowboys head coach Mike McCarthy said Tuesday that the medical staff has cleared Prescott to play. He’s expected to throw 40-50 balls during Wednesday’s practice. Fans are ecstatic at the positive development for Prescott, who hasn’t played since injuring his right thumb in Week 1. Via Clarence Hill Jr. of the Fort Worth Star-Telegram, McCarthy said Prescott must “get his timing back” this week. They plan on him fully practicing Thursday, which could put the 29-yea…