Samsung has no clue. Their Live Chat person said the version I have is invalid. It's BOG5 with the Stagefright prevention.
Verizon is clueless. It's like Samsung isn't giving them any information as to the update or Verizon. Every other carrier has the 5.11 release . Did Samsung forget that Verizon existed? It's ridiculous.
No wonder Samsung are clueless about Verizon's cloneware... they don't even issue it! See
#1.6 of
41 Galaxy S5 models - Dummies Guide
However,
OG5 is the latest release from Verizon and has the first security update, (there has been 2 more since then from Samsung), with partial fixes for Stagefright, I believe. Use
Stagefright Detector, free from the Play Store to check your security.
As you can see from
this thread, Samsung has not released Android 5.1.1 to any of its international and regional models, both carrier branded and unbranded, worldwide and may indeed choose to bypass it, as they did for Android 4.4.4, and go straight to Android 6.0.
IIRC, it is just the U.S. minority variants for AT&T, T-Mobile (US) and Metro-PCS that have Android 5.1.1 so far.