[TangoLimaSierra]

IRS site specifically says you will get the stimulus check in the same manner you get your SS checks.

Only if you got a refund by DD.

Addendum: Or if you did not need to file and receive your SS by DD.

[nclaurel]

Directly from IRS site.

The IRS will use the information on the Form SSA-1099 or Form RRB-1099 to generate your payment. You will receive your payment as a direct deposit or by mail, just as you would normally receive your benefits.