Unity Ads and IOS 11

Hello,
I just received an email from Unity, it saying Unity Ads SDK 1.5 will not run in IOS 11, and we should update Unity to 5.5 or newer. I have several games on app store last year, and the Unity version in 5.3+. And I just tested the game in the IOS 11 Developer Beta 5, I can get ads.
How can I check if my Unity Ads is 1.5 or 2.0?
If I can get ads in IOS 11 Beta 5, does it mean I don’t have to upgrade my games?
Thank you very much.

does the latest 2017.1 version has Unity Ads 2.0+?