Checked Verizon's website and it is indeed the June security patch. I'm quite impressed on one hand, up until May I'd NEVER received a security patch in it's current month, now on the S8+ it's happened twice in a row - got the May patch in May, and the June patch in June.
On the other hand, pretty disgusted with the lazy or just sloppy butts at Verizon, pushing out a security patch identified as the Oreo upgrade. Seriously? You had one job, update dude...