I use KDE in Wayland, since from 5.13 the main support for X11 will end and Wayland works much better. The only issue I face is KDEs global menu, which I am not able to use, since it is just not visible.
Is there a specific package I might need to install or something I might need to change in QT?
X11 will still be used by KDE Plasma in the foreseeable future. There is still a lot of work to be done as evidenced by the following quote from KDE Decides the Three New Challenges: Wayland, Consistency, and Apps published in September 2019:
Even Kubuntu 19.10 still defaults to X11.
Source: https://kubuntu.org/news/kubuntu-19-10-is-released-today/
Given that 19.10 is the precursor of the next LTS to be released in April 2020, X11 will be supported by Kubuntu till at least April 2023.
So, if you use an X11 session, global menus are available for the applications that support them.
If you want to track the progress the KDE team is making with Wayland, monitor Plasma/Wayland Showstoppers.