I happen to have a Galaxy A5 2017 and I have been waiting for the 8.0 oreo update for a while now. On the official samsung members forum, I read that the official date for the update was June 11th. Hooray! Except that it is now the 15th and no update.
If it hasn't been pushed out to you yet then no. Samsung might have delayed it slightly or carriers might need a few days to push it out after receiving it. I wouldn't worry about it. Often has small delays and it'll come.
Just check mine and no it hasn't been pushed yet... Where did you read about it being released and were they talking about the Canadian version, or carrier versions, or unlocked international version? Do you have a link to the article you can share