Shanghai to Singapore Cruise with Princess 25/02/18

We fly into Shanghai from Abu Dhabi on 23/02/18 at 10:25am staying at Four points Sheraton Shanghai for 2 nights, departing Shanghai on Majestic Princess at 5pm on 25/02/18 - will the 144 hr Shanghai Waiver apply for my wife & myself, as we do not re-enter China on the cruise after our departure ? If so where when and how do I apply for this 144h Waiver please. I do not want to arrive finding we need a full travel visa on arrival in Shanghai. Thank you David Brown