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I have this exact functionality in my addon (assuming you are talking about non-empowered artifacts only). You can simply use the "artifact tier" available through the regular Artifact API in combination with the number of purchased traits (54 for tier 1, unlimited for tier 2 as mentioned by others).
Tier = 1 means it hasn't been empowered, tier = 2 is what you get after completing the quest. Presumably, the new ranks are going to turn it into a tier 3 artifact in future patches.
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