At that time, as a routine process, the USCIS officer will notify you by official correspondence of the decision of the USCIS with respect to that removal of the condition of that LPR status.
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If you attended an interview for adjustment of status based on a marriage which is less than two years, it is likely the officer is informing you of your need to remove conditions with a Form I-751 in two years. It should not be construed as an approval, you should await a final written decision in the mail to be sure.
Without knowing more, there is no way to discern what was meant by the paper you signed and the comment made by the officer. It sounds like you might be approved, but the statement by the officer that if he needs anything he will let you know seems to negate the paper you supposedly signed. Just be patient and await the notice that will either contain an approval or denial of the application.