The Android Pie build for the Galaxy J7 Prime 2 carries version number G611FFDDU1CSD8 and is just over 1GB in size. It bumps up the security patch level on the phone to May 1, 2019, and also brings in One UI which is the latest iteration of Samsung's custom interface.
A complete changelog of this firmware is currently unavailable, but it's safe to say that it comes with features like Night Mode, a floating keyboard, and adaptive battery. The update should reach all the units in India in a week or two, but if it doesn't, you can try pulling it manually by heading over to your phone's Settings > Software update menu.
I feel that this comment will not show up because of url doc.samsungmobile.com/SM-G611FF/INS/doc.html Here full update log
And yet my daily driver perfectly mint condition S7 edge still not getting pie; no dark mode, no One Ui. Super great camera but lack nightscape/ nightmode feature, Sigh.