I don't think they have released any tables (manual to be updated perhaps) yet for pop up attacks for the F-18.
If you google Pop up attacks you will find some info for the F-16 which could give you an idea of when/distance to start your attack and at what altitude to roll in at, etc...
They are the same bombs (MK 82, Mk 84, etc) so the release parameters should be the same to achieve the correct ballistic path to the target.