Depending on the law in Nevada, if these charges are simple misdemeanors, then it should have no effect on your application to extend your green card. USCIS always needs these type of records for any green card application, so don't be too concerned. Generally matters such as these will not rise to deportable offenses, but they could have effects on your ability to obtain US citizenship for the next five years. There is no sense in not responding to their request since they already have knowledge of your arrests from their background checks (they just need the actual paperwork), so whether you extend your card now or later, they will still need this information. Thus, since you are already in the process, just go ahead and send the copies to them.
When you send the documents to USCIS, make sure you send the certified arrest record, the certified court disposition, and proof that you completed whatever sentencing was given to you (i.e. fine, probation, etc.).
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