But mama I ain't done yet
Sit back and watch your sunrise
Kick back and know yo son set

Meaning

He’s telling his mom he hasn’t accomplished all that he wants to yet

He’s telling his mom to relax and watch her son succeed. “Son rise” sounds like sunrise and people often sit back to watch the beauty of a sunrise

Then he continues to play on sun imagery by telling his mom to relax and see that her son is well-off (“son set” = sunset)

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