In general, the format for the progress report is the same as for the work breakdown document. For tasks that have been completed, note when it was finished. Existing tasks should be re-evaluated to ensure their due dates are still realistic.
If you have modified the scope of your game to improve your ability to complete the game on time, please describe the reduction in scope after the table. This can include things like having fewer choices of player character, fewer levels, fewer monsters, etc.