I made some research which took quite some time, so I thought on sharing it in this post so you can also benefit of the information.
I was looking for a Thunderbolt 3 Dock which would allow me to connect my external ultra wide screen, keyboard, mouse, Ethernet network and some other things to the dock and then with the plug of one single Thunderbolt 3 cable from the dock to a 2017 MacBook Pro 15″ which I ordered. I would like to be able to connect all the things AND charge the notebook at the same time without the need to plug the power adapter of the Mac.
You have to be careful because not all docks charge a MacBook Pro 15″ (they dont have enough power).
The only models that would do so until today (July 19th 2017) are: