205/55/16 is what the '18 Base model uses for tires so those are specced to work for sure as long as the wheel has the correct offset & of course bolt pattern.
Beyond that a online tire size calculator would tell you what changes you would see going to your proposed size.
2018 SL Pearl White, LOVE ProPilot Currently at 4.1-4.5 miles/kwh as I learn to drive pure EV & the weather gets colder.
Sept 2018: AHr= 114.52 / SOH= 99.2 / HX= 99.70% / 14 mV cell delta
2013 Prius 2, 126K & still really enjoy the car