If you are applying while in US you must submit:
(i) Form I-539, Application to Extend/Change Nonimmigrant Status, with the fee required by § 103.7(b)(1)
(ii) The fingerprint fee as required by § 103.2(e)(4)
(iii) Form I-693, Medical Examination of Aliens Seeking Adjustment of Status, without the vaccination supplement; and
(iv) Evidence of eligibility as described by Supplement A to Form I-539 and described below.
Evidence. Supplement A to Form I-539 provides instructions regarding the submission of evidence. An alien applying for V nonimmigrant status with the Service should submit proof of filing of the immigrant petition that qualifies the alien for V status. Proof of filing may include Form I-797, Notice of Action, which serves as a receipt of the petition or as a notice of approval, or a receipt for a filed petition or notice of approval issued by a local district office.
Note, that you may also apply for employment authorization.