When samsung Galaxy s8 plus get pie update ???

i have samsung Galaxy s8+ now my phone have fast charging problam it's take 3/4 hour to full charge of my phone last time i updated my phone i have this problam i dont know it's software problam or or hardware please help me. what is a mean problam. ...

why i dont get update this is not fear all my friends get android 7 but i still is android 6