@hybridaman19 You don’t need any additional licensing unless you plan to include DAZ 3D meshes in a game, app, or other downloadable product.
For 2D renders, such as images or videos, you’re covered for commercial use under the standard license that comes with a regular purchase.
If the characters aren’t going to be interactive (for example, in a video game), then the standard license is all you need.
Just keep in mind that you can’t provide your client with the original 3D character files (so if you do don't say to Daz and you'll be fine), and you shouldn’t resell or distribute the models, even in modified form.