I have been notified on my iPhone that i will receive an update tonight iOS13.5.1 is this OK

13.5.1 contains several important security updates

Access it through Settings, about, Software Update or via iTunes/Finder and by no other route

It would be better if you can please re-post with a screenshot, in order to understand the phenomenon better. Images / pictures speak louder than words. (Do not provide any personal credentials, such as email id, apple id, IMEI number, Serial Number, Phone number, if you are sharing a map ensure your location is not identifiable. etc)

My iPhone 6+ and my update is iOS 12.4.7 that I did a two days ago. More updates to come soon but I can't update to iOS 13.5.1 because my iPhone 6+ is too old.