Is it possible to change notification bar on Android Pie?
I believe you can do that. Download Good Lock 2019 and install Quickstar. You can move the clock back to right, or even hide it. You also can hide/unhide other icon on the status bar.

If you are unable to use Good Lock, there is alternative. Download an app called "Nice Lock". Then you need to manually download and install "Quickstar apk" from apkmirror. After that, open Nice Lock and from there open Quickstar.