Hi Vangaru,
There is no need to wait for 140 approval or receipt notice.
Its always advantageous to file 140 and 485 concurrently as the processing of 485 ( which seems to be taking the longest processing time ) depends on 485 receipt date and not on 140 approval date.
Unless you have other reasons, go for concurrent filing.
I would appreciate if other experts can offer advise too.
Wish485