iPad Pro iPad Pro 11" and External Monitor - what is the resolution?

[vddobrev]

I have a brand new iPad Pro 11" 3rd generation, and I am wondering if I connect it to external 4K display, what will be the highest resolution? I am aware of the black bars and aspect. Asking specifically if the resolution will be higher than 1920x1080 - I am using VNC to connect to a server at fixed resolution 1920x1080, will I be able to see the whole VNC screen.
Sorry if this has been answered, search did not reveal results.

 

[XIO[-]OIX]

I care about this too, since I want to buy a monitor for the iPad