According to the iMore Blog article via the following link, iOS 12 Public Beta 1 is now available for those who are interested in giving it a try.
https://www.imore.com/how-download-....15294571818.1529962414-1914076707.1529457181
https://www.imore.com/how-download-....15294571818.1529962414-1914076707.1529457181