The current workflow version can be found in the Workflow details panel and will display the date and time it was last updated. To access this, select the workflow you wish to view.
Clicking on the Workflow Version History button will open up the Version history panel. This will show the version number, the date it was created and the status.
To view further information such as notes, name, description, and author version ID select the required version, this will open the version detail panel. You can also archive the version (permissions allowing) from within this panel.