Hi @Irj, and welcome!
Judging from your error messages, there are a couple of dependencies that Rcmdr needs that are missing in MacOS.
The first is the command line components for xcode in order to compile some packages in R, as well as additional functionality such as git. You don't need to install all of Xcode, but in the terminal, type xcode-select --install
This addresses the error message: xcode-select: note: no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.
The second missing component is Xquartz, which is a X11 windowing system. This can be installed from the link on https://www.xquartz.org/ or via homebrew as brew cask install xquartz.
This addresses the error message: Library not loaded: /opt/X11/lib/libX11.6.dylib and is a dependency of tcktk.
HTH