The Athletic did a piece on the new EFL/Sky deal last month that says:
So should at least get significant advanced notice compared to the PL.
Some people might be unpleasantly surprised regarding the amount of games that could be moved away from Saturday 3pm though.
Of the twelve Championship games each weekend, five will be broadcast by Sky (on a combination of TV & streaming). This means that those five cannot be played at Sat 3pm as the blackout remains in place. The plan is that a typical week will see these split out with one on Friday night, two on Saturday lunchtime (streaming) and the final two at some point Sunday or Monday.