I’m mainly asking the area to select and build for Mac is no longer grayed/blocked while i’m working on a PC.
No you cant build unity Mac / iPhone games on PC
Someone actually asked this before: Do I Need a Mac to Make a Game for the iPhone? - Unity Answers
You can still develop even if you don’t have a mac right away, but at some point you will need it.
Here’s a link for Unity’s how to get started with IOS development: