Application status?

Just out of curiosity, how long after the application status page switches to “Your application page is currently under review” do people typically receive a decision?

No set timeframe. Can be a few days to a few months. Usually the latter, especially at this time of year. I would not expect to hear until December if you applied early action. Virtually no one hears before October and a few hear in November. The vast majority of decisions come out in January for regular decision, so my guess would be December for early action.