is this live or active ?
Yes WMS is live and its been used by many people.
To read more about it visit http://support.dearsystems.com/support/solutions/articles/11000052515-dear-warehouse-management-solution
I recommend putting a link to the article you supplied on the DEAR WMS integration page, the current description "Configure how DEAR Warehouse application should work." is of little help—there should also be a thorough explanation of each of the settings.
Our workplace is Apple based, so we'll have to invest in an android tablet to trial the WMS. Is there a forecast of when this app will be available on Mac OS?