Not many QB's in the NFL call their own plays these days. It is definitely the norm for the plays to be called from the sidelines. Allowing a young QB to call his own plays is not likely, no matter how much you like the young QB. Sure, they are given the freedom to audibilize, but that's different from calling one's own plays. Generally, the QB needs to not only be a tremendous student of the game, but also have a fantastic understanding of the offense. Someone like Ryan Fitzpatrick might have been given that ability from his familiarity with the offense from before--and because he is objectively one of if not the best intellectually among NFL playing QB's. But still, this offense in 2020, while familiar, had not been fully implemented by this staff, so it is unlikely they gave him control over the play calling. To expect a new OC to come in with a new offense and hand it off to a 2nd year QB ... that's simply not going to happen.
Not trying to burst your bubble, but don't expect Tua to call plays in 2021. The hope is that he quickly masters the playbook and can make decent audibles. Then, if he demonstrates true mastery, the coaches might let him call some of his plays down the road. Then again, most coaches never relinquish the play calling. It's a big part of the control they can exert over their team ... and since they are the architects and they spend by far the most time devoted to studying, strategizing, theorizing, gameplanning, and testing those plays .... they're also usually the most qualified to call the plays. When the team starts to struggle, coaches who let their players call the plays are usually labeled as poor coaches, so the coaches don't allow it most of the time.