Get size of screen in x y coordinates

I’m implementing a “wrap around” 2d game. When an object begins to go off one side it begins to show up on the other. I want to be able to say

if(transform.position.x > screen_width)
    ...

So how do I get a value for screen_width? I can get the size in pixels with Screen.width, but how does that translate to the coordinate system?

Check this answer world to screen