Yes... Currently there are 5Daily Hong Kong-Guangzhou flights all operated by China Southern Airlines...
CZ302/CZ306/CZ308 are operated by Airbus A320 according to schedule while CZ304/CZ320 are operated by Boeing B757...
And the departure time are 1020/1320/1620/2020/2120 at Hong Kong and their flight time is scheduled for 45minutes...