Google's Pixel flagships usually debut in October, but there's a chance the Pixel 5 could be different, as word on the grapevine claims the phone may be delayed. The Pixel 5 is expected to eschew the Snapdragon 865 in favor of a cheaper sub-premium Qualcomm 5G SoC.
https://www.notebookcheck.net/Google-Pixel-5-launch-may-be-delayed.466213.0.html