Yes Sir you can file Annual Return FORM GSTR-9 for FY 2018-19 till 31st December 2020.
As per Notification No. 80/2020 - Central Tax, dated 28th October 2020, the due date to file Annual Return for FY 2018-19 has been extended to 31st December 2020 ( 31/12/2020 ) from earlier 31st October 2020.