Could you please let me know if any script is available to find all the workflows along with total actions and number of particular actions?
have you seen this?https://community.nintex.com/community/tech-blog/blog/2015/02/06/know-your-workflow
There is indeed a script for just this that can be used for 2010 or 2013 On-Premise workflows. I've used it and it does the trick: Find All Workflows. There are 6 parts to Vadim's posts and I'm sure you will find something that is of use to you there.
Retrieving data ...