I-130 was approved, is it too late to submit I-485?

[cmme]

helping my cousin with his paperwork, his I-130 was approved and notice has been received that visa number is available, that letter was followed by instructions to fill out DS-230 and I-864 (affadavit of support) however, just now becoming aware of the ability to file I-484 (and I765).

Is it too late to file the the I-484?
Do I still need to file the DS-230?

any help would be greatly appreciated.