It means that everything should be ok, just be patient.
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The two files (petition and I-485) have to be merged. You were likely interviewed on a temporary (T) file. You may want to retain the services of an immigration lawyer to assure that the case progresses smoothly.
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You are not to do anything except be a little patient and follow up after 30 days if you do not get the transfer notice in mail or you do not hear anything from the Department regarding you application.
This response is general in nature and cannot be construed as legal advice, given that not enough facts are known. Any comments offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship. You are encouraged to seek independent and private counseling for a complete review of your case.