Does using OpenGraph meta tags help webpages to get indexed better?
No. Google does not use OpenGraph tags. It is proprietary to Facebook.
Additionally, they are functionally no different then the description and keyword meta tags which Google has stated is not used in their algorithm.
Its open protocol so many other social media sites do use like Pinterest, Google Plus do use them check here https://developers.google.com/+/web/snippet/.
It will add up your SMO which in turn will help your search results too.