Yes, as noted by @xmasbaby earlier if he is not your dependent. When your son inputs his personal information in the "My Info" section he will be asked if he "Can be claimed as a dependent on someone else's 2020 tax return?" He will answer "No." Will someone claim him? He again answers "No."
Next, after entering his income and deduction information he will arrive at the "Federal Review" section. There he will indicate that he did not receive any stimulus payments. If the stimulus questions do come up automatically, he can select the "Federal Review" tab or type "Stimulus" in the search box and use the "Jump to... link" to get the stimulus questions.
The missing stimulus amounts will be added to his return as a Recovery Rebate Credit on line 30 of his form 1040 as noted in an earlier post.
The 2020 tax return, once processed will establish his eligibility for the third round payment as well. It will be sent separately.
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