Can I have bus schedule bus from Nanxun to Shanghai Long Distance Bus Station?

Yes, as I know, there are many coaches from Main Bus Station that can take you to Shanghai directly. The bus schedules are from 07:35 to 15:30. The ticket fare is about CNY 47 per person.
By the way, the pick-up station is nearby Xunxi Bridge, close to No.318 National Highway. You are still suggested to check the bus schedules when you arriving at the coach station. :)

Thank you Jane.