“If you file I-140/485 concurrently before Sept 15, 2003,”
---- Your I-140 and I-485, EAD, AP applications should reach the BCIS office before September 15,2003, no need to wait file immediately.
Your stay will be legal once you file I-485 but for work you need H1 or EAD after your H1 expires, I don’t know your service center if it is NSC then send the color copy of your driving license and first page of passport that has your photographs (send color copy to avoid any delay or RFE for EAD. The other concern is that for I-140 many are getting RFE for education evaluations and employer financial documents if your I-140 gets any RFE then EAD will be delayed.
I have just read post from a lawyer site that after 9/30/2003 employer is not required to pay $ 1000 as training fees, better sent your 7th year extension based on approved LC before they pass the new law to get $1000 from employer for H1b extension (bill is pending in congress for that)
If you apply for 7th year extension then you will be safe to work if any delay in EAD or RFE for I-140.