Mario Kart Tour delayed to summer 2019 - Polygon

Mario Kart Tour, Nintendo’s next smartphone game, will launch sometime this summer. Originally planned to make it to Android and iOS by March 31, the mobile version of Mario Kart requires extra development time, according to Nintendo.

News - June, 2019

Game News Roundup: February 2023 – The Avocado

Nintendo's Mario Kart mobile game delayed until summer - CNET

Mario Kart Tour has been delayed into summer 2019

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Mario Kart Tour Delayed to Summer 2019 - IGN

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Mario Kart mobile delayed until summer 2019 - BBC News

News - September, 2023

Mario Kart Tour: Summer tour (2023) sneak peek preview: New city incoming!