Because DACA was issued relatively recently (during the Obama administration), and because its eligibility is limited to people who were people aged 31 or younger at the time the DACA executive order was issued in 2012, DACA recipients tend to be young. Most are of working age, and most of the rest will reach working age within a few years at most.
Many of the younger DACA-eligible immigrants are enrolled in school, indicating that they have yet to reach their full earning potential. Nevertheless, by 2017 over 93 percent of DACA-eligible immigrants were employed.
According to the New American Economy Research Fund, DACA-eligible immigrants collectively earn more than $20 billion per year, most of which is either paid out in taxes or spent in the US economy. This amount almost certainly understates the contributions these people would make if their status was stabilized by supportive Congressional legislation.