RTVDTAARA is the cl command to capture the lda
Since you say the CL that submits the command, it will capture the LDA as the job begins.
RTVDTAARA DTAARA(*LDA) RTNVAR(&RTNVAR)
where &RTNVAR is a char variable long enough to capture the *LDA (1024)
then you can send it to yourself as a message or write it to a data area