Better than some other languages I've tried to learn . . . which isn't saying much, I'm pretty bad at languages :>
I know a few phrases and a few odd words here and there, mostly from the names of various dragons/shouts and listening to the Dragonborn song a few hundred times. "kul do od" -> "sons of snow," "Alduin, feyn do jun" -> "Alduin, bane of kings," "joor, zah, frul" -> "mortal, finite, temporary," etc.
Also I stalk the
Thuum.org community from time to time, where half of the users speak Dovahzul like the mother tongue, so that's sort of helpful.