iPhone 7 Plus: 93% (October 2016)
iPhone X: 99% (November 2017)
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Hmmm, ok, then not sure when that option shows up. Supposed to be included in todays update. I have been using the new battery heath monitor for a while on the beta and hae not seen the toggle either but when it drops to a point it should appear I'm thinking. Maybe someone who knows will chime in. Also was wondering when the cpu throttling kicks in. Maybe that triggers the other.
Toggle shows up once there's been an unexpected shutdown. It's not tied to a certain battery percentage. It also depends on the conditions of the environment. A cold day may trigger an unexpected shutdown.
Most people are expected to see the performance management toggle at 80%. Some batteries are better than others so they might not see the toggle until <80%