Probably not for a month or so, at least as to all the changes. Maybe just some basic stuff until then. Then they may want his opinion, as what he likes and what he is better at doing.
The coaching staff still working on it most likely.
This is all guess work from me. But seems logical it will be 2 to 4 weeks before the 1st OTA's.
Also they will need to adjust a few things as players leave and new come in. Such as what do they do with Zeke. I am sure there would be plays that need to be switched up for the type of RB they have.
Rather Zeke or a rookie, or Pollard plus a rookie.
So it would not be wise for Dak or any player to study plays that may not be there. Unless they feel the offense is a plug and play type.
Again just my opinion.