Celoxis helps you compute the % Complete of the task depending on the elapsed duration of the task with the help of Mark on Track option.

For e.g. A task T1 with duration of 10 days. You have been working on the task and today is the end of 5th day, but haven't yet entered any progress updates on the task. As the progress of the task is as expected, you can just click on the option seen in the screenshot which should change the % Complete of the task to 50%.

To mark progress on track:

From a task report, click on the action's drop-down menu.
From the Status Update section, click on On Track. The task's progress will be updated.

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