Try again, you may be offered the choice now.
I noticed in Sept. 2018 that the Wayland option under the gear icon at login was offered and worked on my laptop running Ubuntu 18.04 with the Nvidia 390.48 drivers. After the initial installation of 18.04 in May, the Wayland option was not offered, but after some update, that changed. Try again, you may be offered the choice now.
I just noticed that maybe all that happens is that the switch to the Intel drivers has been implemented. The Settings/Details/About show the Intel Sandybridge for Graphics.
lshw -c video shows both.
For my Ubuntu 19.10 install, Wayland is not offered if the Nvidia proprietary drivers are installed. The automatic switch to the Intel drivers was removed, as was the Wayland login option.