My mother came to US on tourist visa in Jan 2020, applied for her extension of stay (form I-539) in June 2020, the application is still pending and her 1 year in US would complete in January 2021.
1). Can one stay in US until application is pending ?
2). Suppose USCIS approve the application in Feb 2021, till what date will they approve the extension January(end of 6 months of extension) or the day they approve the application) ?