In the latest ElvUI, they added support so that Death Knights can see their Ghoul's time remaining as well as dismiss the pet via right click (Non-Unholy DKs Ghouls are not treated as pets, they act more as Totem 1).

See screenshot here, there is just some slight overlap of it's placement in a default configuration. Screenshot taken from PTR where a clean install was easy to perform and showcase with no other addons.

Here's a better screenshot of it, it's visible in the bottom left of the screen slightly overlapping part of the actionbar.

Yes, let me take a look. I missed this addition update it would seem.