Another big potential transaction coming up...Kid is a consensus top 3 prospect in baseball doing stuff few minor leaguers his age have ever done. His .325/.380/.551 slash-line in the high minors following the return of the regular baseball is Acuna/Rodriguez/Tatis-like. He looks primed to make his major league debut sometime early next season, if not by opening day, and assume the role from Yelich/Burnes of the "face of the franchise". He's still super young and untested for sure, but there's a very good track record with minor leaguers who have produced like he has at his age.
Question subsequently becomes: WHEN do you offer him a contract extension and WHAT do you offer him to ensure you have him locked up through his early to mid prime seasons as you attempt to open up a window for an extended World Series run? You probably want to see him get some major league run first, but, at the same time, the longer you wait, the more expensive he potentially becomes. See: Burnes, Corbin. Guerrero Jr, Vlad.
For reference, other recent extensions for prospects of his ilk:
-Wander Franco, TB: 11 years, $182 million guaranteed, 12th year option, $41 million in incentives
-Julio Rodriguez: 12 years, $210 million guaranteed, options for 5 more years, $260 in incentives
-Corbin Carroll, 8 years, $111 million guaranteed, 9th year option for $23 million
FWIW, assuming everything proceeds on schedule and Chourio shows well in the majors, I would offer him something like 8 years $120 million guaranteed. with a club option for a 9th year at $23 million. Offer to be made a month to two months after his major league debut. That's guaranteed life-changing money for someone like Chourio, and he could still enter free agency after his age 29-30 seasons. Brewers would be able to have financial certainty in working his contract around Yelich's, while having a new "face of the franchise" to market statewide.