I accidentally deleted Safari on my Iphone. How can I reinstall please?

Safari cannot be deleted. Apps that can be deleted:

Delete built-in Apple apps from the Home screen on your iOS 14 or iPadOS device or Apple Watch - Apple Support

Here is how to find apps:

Find your apps in the App Library on iPhone - Apple Support

To reset the home screen (which will sort re-apps alphanumerically, and will delete added folders), see:

Return iPhone settings to their defaults - Apple Support

And Screen Time seemingly exists to cause confusion, if you’re using that.

The Safari app is not one of the apps that can be deleted but with iOS 14 it can be removed from the home screen. If you have iOS 14, go to the App Library (swipe left past your last home screen). From there you can touch and hold an app and slide it left back to the home screen.

Another reason for it not being visible is due to a restriction. Go to Settings and tap Screen Time. tap Content & Privacy Restrictions. tap Allowed Apps. See: https://support.apple.com/en-us/HT201304#allow-apps

Check for it under the App Library. Next to the last page of the Home Screen.

Call it what you will -Screen Time was the culprit - thanks!!