It's a fair question, though if you are given an 81-win team and win 81 games are you bad at your job? If this team fails, it will be on the players, and on the GMs who signed them. Klentak made most of those moves, but Dombrowski implicitly endorsed what he built by bringing back JT and Didi and not doing anything more dramatic.
I think Joe has probably earned the right to have a third year, which also happens to be the last year of his contract (team has option). Between his reputation and his sway with the owner, who is as dithering as he is impatient, he's surely safe. But if this year's team isn't at least buying at the deadline and playing meaningful September games, then you start to have the lame-duck conversation.
It also really depends on what the goal ends up being for 2022, if 2021 is not successful. Do they try to run it back and spend $200 million for the fourth straight year, or do you start the rebuild? Is a rebuild even possible without moving on from Nola and probably Hoskins. If they do rebuild it's likely to be with a new manager.
It's early though. We'll surely spend more time in first place in the coming months, which has also ultimately meant nothing. The Braves are still in last place.