My Stimulus payment

Hello I was told on the get my payment portal that my stimulus was scheduled to b mailed to me? An something bout to the address they had on file for me. I have been on SSI disability for 10 years r more haven’t filed taxes n that long an I have Direct Express where my disability check is deposited on the first of every month it’s the account that social security gives u an just to b sure they had an update of my address I filled out the non filers form an left the bank info blank. 2 friends of mine was also told theirs would b mailed on the first of may they got theirs n the mail 4th r this past Tuesday I still haven’t gotten mine n the mail not n my express account an they r on the same as I am SSI disability. How can I find out bout my money r when I will get it?? Please Help Me thank u so much