Now I read online that if applicant is in USA they can apply for I-485 too. I am confused am I eligible for this rule or can somebody explain me the whole procedure please.
If your priority is current and you are in a valid nonimmigrant status, you can apply for adjustment of status, yes.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
The filing of an I-130 is only the first step in your parents' efforts to immigrate you. Currently that takes about 7-8 years to process and have an immigrant visa number available for you. You can only file the I-485 then, once the the case filing "priority date" established by the I-130 petition becomes "current" for your category and a visa number is finally available for you. Not before, not until.
Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
You should also explore with an immigration attorney the chronology of your parents' immigration hisstory in conjunction with your life.
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