How come I can’t get widget smith on my iPhone 7

No, you are not updated. That is showing you that you can download and update the iOS. You need to do that first. You need to connect to wi-fi and then see this, Update your iPhone, iPad, or iPod touch - Apple Support

RiceKing360 wrote:

I am updated

As your screenshot indicates, you have not updated.

Your screenshot tells you that you require a Wi-Fi network connection to download the update. Then it must be installed.

The pop-up tells you exactly why.

The app requires iOS 14 or later.