Help me identify this flower and plant

While on my way to Nepean River for Great River Walk I saw this flower plant at High Street. I stopped and clicked at it but I'm confused since I do not know the exact name of this flower. My best guess is that it's Chinese Magnolia which has large flowers. 

I shall be grateful if any one who reads or see it helps me with its exact name. Thanks guys well in advance for your help and support :)   

Image source my camera~ Image taken at 12.45, 28 August 2017 at Penrith, Australia