These are the metrics used by the status bar on the edge-to-edge iPhone, including notch height and ear width. Designers, have fun, the redesigned status bar would presumably include standard indicators such as Wi-Fi and cellular signal strength, current battery charge level and, possibly, other items.
It’s just a mockup that may or may not depict the real thing. With so many iPhone 8 leaks based on a botched release of HomePod’s version of iOS, we really are not sure anymore if Apple is trolling us so it’s advisable to apply healthy skepticism to these reports.