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congratulation, you already more than half the way. just wait and u will get an interview appointment letter in about 6 months(depend on which local immigration office you filed your 485). go to the interview and u will get you case aproved at the interview and get your famous 551 Stamp on your passport.

(very few will be choosen for background check, this will slow the case for one month to 12 moths. it is very rare)