I have seen a lot of questions on this topic already but my problem is that I am not able to figure out where Julia.exe even exists (as the answer indicates here). I can see all the files with .py extension but none with .exe. I have installed Julia twice already. I am using M1 macOS and I am very unsure as to what am I supposed to even mention in this path.
I tried entering ./opt/anaconda3/lib/python3.9/site-packages but it did not work out. I tried whereis Julia on terminal but it did not work out either. I got no output for this.
I'm a little confused by your question - you say you are using a Mac M1 with MacOS, yet you are trying to locate a julia.exe file, which only exists for a Windows installation.
Have you followed the installation instructions for macOS on the Julia website? Quoting from there:
On macOS, a julia-1.8.5-mac64.dmg file is provided, which contains Julia-1.8.app. Installation is the same as any other Mac software: drag the Julia-1.8.app to Applications Folder's Shortcut. The Julia download runs on macOS 10.9 Mavericks and later releases. You can build from source for macOS 10.6 Snow Leopard (possibly earlier versions as well) and 32-bit but neither are fully supported.