My older children frequently work on their own to complete their math assignments.
Recently, I began asking them to write two or three sentences at the end of their independent study session to describe what they accomplished today and what they need to do next.
This helps me identify their challenges, but, more importantly, it helps them to visualize their own progress.
This helps them hold themselves accountable for their own study time.
By being accountable, they are prepared to be more autonomous.