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You will need Celery (or other async task queue). To integrate it with Django, see http://celery.readthedocs.org/en/latest/django/first-steps-with-django.html. I recommend to use Celery with Redis, because Redis is often used as a cache, so you don’t need to install another backend for Celery (mostly RabbitMQ).
To get the progress bar, count total number of tasks (len(my_data_array)), store the value in cache (e.g. key total_count) and add the second key (e.g. complete_count) with zero value. In every task that completes, increase the complete_count value.
Last step is to query the status. It is just a simple view that loads these two values from cache and returns to the user (html/json).
Source:stackexchange.com