Yes, the preliminary copy of the proxy statement must be filed with the SEC a minimum of 10 calendar days before the definitive copies are given to security holders. The filing day counts as day one, so Sunday the 19th is day ten.
Note that the record date for shareholders is August 20th, the next day. But the preliminary Proxy Statement says "this Proxy Statement and enclosed proxy card are being mailed to the Company's shareholders starting on or about August 23, 2012."