You don't need to restart the client or any services, just the policy update on the client side.
And if you want to run the schedule daily, I recommend to use "Schedule time" instead of "Schedule Window". Just delete all schedules in the policy "Windows System Assessment Scan", then add "Schedule time", select the desired time and set repetition to "Daily".
Then either wait for the next scheduled policy update on the client, or force it manually either from the client side or via the standard task "Update Client Configuration".