Picky question about border routing

I’m finalizing several designs and want to understand what edge the router will go to. Or, perhaps I should ask - what will be the final edge of my board?

If I draw an 8 mil border in the top silk screen layer (.plc from eagle SPFE-special.cam) how much of that will be left when I get the board?

Sorry for being AR about this but I’ve got some fairly tight mechanical constraints.