The software version of this update is N960FXXU5ETF5 and the size is more than 1250MB. It brings the Quick Share, Music Share, and many camera-centric features including the Single Take mode and Pro video mode. You can read complete One UI 2.1 features here.
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We were expecting the One UI 2.1 update to hit first in South Korea, but the update starts rolling out in European countries. The update should soon be available in other markets. Meanwhile, the Galaxy S9 and S9+ could start getting One UI 2.1 update from next week.
You can check for the latest software update by heading into the device Settings > Software update menu.