Have iPad 4th generation model 1459 can it be updated thave iPad 4tho iOS 11

No, it cannot. It is too old, too under powered, no longer supported and completely incapable of running the now required 64 bit software.

iPad Mini 2 CAN be updated to iOS 12. iPad 4 cannot be updated beyond iOS 10.3.5. Different devices and generations.

I have an iPad mini 2 and I wanted to get an app on it but I need to have iOS 12 or up So I updated it but for me I had to wait two days Because it didn’t show me that they were two updates available on the same day so you could try but it might take you a while I don’t know