Microsoft project management software used to plan, manage, and communicate a project schedule and other information among workgroup members, project managers, and other stakeholders.
Don't enter % complete. Once you have a status date (project information) which is in the recent past, like yesterday 17:00, and the monthly task is/was done, actually started and finished as scheduled (a bit earlier than the status date), just select the task and click mark on track (task ribbon).
If it is actually started and actually finished, but on different dates than those scheduled, use the tracking table to correct the actual start and actual finish.