My iPhone 7 plus not update why? I m connect to wifi

for as far as I can see, you're not connected to wifi there is no wifi logo in the top of your screen

See this link for further instructions on how to connect to wifi

Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support

And see this link about trouble updating your phone and troubleshooting with updating your iPhone via a Mac or Windows PC

Updating/upgrading your iPhone - Apple Community

Nope, you’re not connected to WiFi. You’re connected to a hotspot. Not the same thing at all.