Basicly, it's China, France and Brasil that will dictate the outcome on the overseas gross.
With no competition for two weeks (including one weekend), China is likely to add $40 to $50M depending on how people will keep on responding.
Brasil and France are the one whose progression may be hit harder by Godzilla since the other markets are already running out of steam.
Japan has a chance to add a few millions too before DOFP comes in.
The Godzilla release may also be stronger than usual if people flock en masse to see it before DOFP released the next wednesday the 21th earliest (France and Belgium).
So it could be a two punch straight for Spidey.
I beleive next weekend will seal its fate. If it can generate enough cash while facing Godzilla cause after that, i don't see how it could generate tens of millions from those markets between Godzilla and DOFP.
For me, it has to reach at the very least $475 M by next sunday to have a shot at $500M overseas.