I applied for extension with VSC. It took them 2.5 months to issue RFE (financial support documents and evidence that my parents have residence abroad), I replied. Yesterday I checked online status, APPROVED.
To answer your question, as long as the petition for extension is pending, your parents' stay is legal. Don't worry about a thing.
To answer your question, as long as the petition for extension is pending, your parents' stay is legal. Don't worry about a thing.