Can i file 2020 taxes if i have not received my 2019 refund yet? i also have not received any of the stimulus payment, the irs posted my 2019 return will be mailed feb 2

as of today the irs web site says i will get 2019 refund mailed to me on feb,2. First--- should i wait to file 2020 taxes till i actually get the 2019 refund? second--- i never received any of the stimulus payments at all, what do i do?