Retrieve Business Process Flow Stagename in Dynamics 365

Hello All,

I have been implementing a workflow and I need to capture the stage name (qualify,develop,propose,close) on opportunity for calculating the amount of time spent on each stage. 

I am unable to capture the stage name. I can't find process stage field in the list of 'When Field Changes' in workflow. 

I have followed the following links but still no luck

https://www.powerobjects.com/2015/01/19/accessing-business-process-name-dynamics-crm/

https://worldofitguy.com/2017/06/23/use-workflow-to-fill-a-field-with-the-stage-name-besides-the-opportunity-entity/

I am using Dynamics 365 version 9.0