Is my ios 10.3.3 downloaded already?

Earlier I just got a notification for ios 10.3.3 on my iphone 6s. The "install now" button is greyed out and I never updated my phone yet. But it says "downloaded". However I still have a red notification on settings saying I need to update it? I'm very confused

If your phone is set to automatically update, it downloads but waits for you to install.

You might need to free up some space on the device before installing. I did mine yesterday