Is 4K there yet?

So, two 1440 screens in a top/bottom layout? (2560x1440 I assume) So, effectively totaling 2560 wide by 2880 tall I suppose? How are you connecting them? I use a laptop with a Thunderbolt 3 dock so I can add some extra displays but can’t get crazy with it. The dock has an HDMI and a Mini Display Port. The laptop has an extra HDMI out.
I like the idea. lot’s of real estate. Still each screen individually has the right aspect ratio and the applications and plug-ins are still a pretty good size and not too small. I am still just feeling out the situation. Thanks for the input.