Max Fried is another obvious candidate as he has been very solid for many years. This year has been his most impressive as he has a 2.60 ERA/2.45 FIP/2.00 SIERA slash line. I wouldn’t be surprised at all if he received an extension. He will hit age 31 when he becomes an UFA, so that may give the braves pause for an extension.
Vaughn Grissom has absolutely scorched earth in his first 28 plate appearances. He currently has .400 average with a pair of home runs. He has already integrated himself into this powerful lineup, leaving them with even fewer holes. He will definitely have to keep it up, though, for the Braves to pull out their checkbooks. I am sure they are watching though.
William Contreras is having an outstanding year with a 134 wRC+. He averages a home run per 15.6 plate appearances, which is very good. Another player not set to hit free agency until 2028, they may choose to get ahead of the game and get an extension in his hands.
In conclusion, the Braves have an embarrassment of riches when it comes to young talent, and they are wise to lock up that talent for the foreseeable future.