The articles I've read about the casting and that it was green lit go back to December 2020, so given a 2-3 year production cycle you're probably looking at late 2022/2023 at the earliest.
Although given that it's a Hollywood adaptation of a video game, the more accurate answer is 'F knows when'.
The Sonic Movie for example had talks of an animated film in the 90s followed by the live action one in 2013....at Sony, before Paramount finally got the rights in 2017.