I got the May patch on May 16th (UK SIM free TA-1012)
I'm from Italy too, TA-1004 model, no brand phone bought on Amazon web site on november 2017, Vodafone sim card operator.
I've received Oreo 8.1just a couple days after Nokia-HDM released it all over Europe, May security patch the very same day they released it all over the world.
I received the May patch on the 20th of May (Nokia 8, running on the Three network in the UK).
I also got the May security patch.