How to track progress of individual tasks

Vasantha,

Is your team working from an accepted Sprint Backlog each sprint that is composed of user stories and issues? Are all of these items estimated?

A centralized Sprint Burndown chart can provide a dynamic way for your organization to view your team's sprint progress, as long as the team is vigilant in maintaining story status.

I would also propose inviting them to listen in on your team's Daily Stand-up meetings, as this can be another method to gauge sprint progress.

In Scrum the "leadership team" tracking daily progress is the Development Team. They manage and are responsible for their own work.

Impediments can be raised by them to the Scrum Master. Does the situation you describe represent an impediment to the team and their ability to meet the Sprint Goal?

Looks like you are maintaining two separate backlogs for sprint - in Rally and in Github. Merge them into one and generate custom reports as per your leadership requirement.

Take all the work that your team needs to do. Prioritise them. If git hub work is popping in at the middle of the sprint make sure your team manage priorities and work on committed items.

Have all the sprint backlogs in one place to track progress