[Noob Question] How will I know if my T450s is fully charged?

Hello r/thinkpad,

I apologize if this does not belong here, but I just had some a couple questions as I am a new Thinkpad user. I recently purchased a T450s and I have plugged it in to fully charge it before use but I was wondering how will I know when it is fully charged? I do not see any LED indicators or anything. Another question I had is that my T450s did not come with a Windows Key label, is it supposed to?

All help is greatly appreciated!