Cruise became standard in 2019 here. My guess is the 2017-18 Rostra kit would work without issue. They aren't going to sell 2019+ kits for cars that have factory cruise here.
Adding a Rostra kit to a 2017-18 would be no different than a 2019-20. There's just no need here for it. Someone would have to point out a change in the Mirage that would prevent it from working in a 2020.
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View my fuel log 2015 Mirage ES 1.2 manual: 49.6 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.5 mpg (Imp)