Generally, if the priority date is current, we submit both the I-140 and the I-485 packet simultaneously.
(213) 394-4554 x0 Mr. Shusterman is a former INS Trial Attorney (1976-82) with over 35 years of immigration experience. His response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.
I-140 and I-485 should be filed simultaneously. Filing the I485 after I140 is tricky because it may be rejected until the I140 is actually approved. Check your priority and hire an immigration attorney to complete the process correctly.
If the visa for your category is current int eh EB-2, the you must immediately file the I-130/I-485 together. It is important that you do so, as they numbers in the categories may change by next month, so please see assistance from an experienced immigration attorney. We may be able to help you, vegalawfirm.com. Good Luck.