It's for all immigrant visas. DQ means Documentary Qualified (basically when you've applied for the visa at NVC, ticked all their boxes, and are just waiting for an interview). The current wait for an interview at Lagos is 16 months ish (https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/iv-wait-times.html), but it looks as though you haven't even applied for the I-130 yet? So a long way off a visa, the ban may be lifted by then, and the backlog is likely to be very different by then too. I'd just get the I-130 submitted asap to start the process.
Good luck.