In fact, Galaxy S5 owners (model SM-G900L) in Trinidad and Tobago claim that they are currently receiving update G900MUBU1CPC3, which would mean that the smartphone will be running on the latest Android 6.0.1 Marshmallow update after installation.
In fact, we have also heard that Sprint had started to introduce Android 6.0.1 Marshmallow to the Galaxy Note 4 and Note 5 prior to Android 6.0 Marshmallow elbowing its way to the Galaxy S6 edge+ devices all over the world. It would seem that with Trinidad and Tobago getting this update, the rest of the world should not be too far from the list.
Do bear in mind that the Android 6.0.1 Marshmallow update will be rather large in size, where it will weigh in at a whopping 1.47GB that will throw into the mix signature Marshmallow features such as Doze and Google Now on Tap, accompanied by a couple of hundred plus emoji and the March Android security patch.