I wrote a blog about:

Keyword A - Ahrefs KD 0 and KSpy KD 40+
Keyword B - Ahrefs KD 0 and KSpy KD 13+
Keyword C - Ahrefs KD 0 and KSpy KD 13+

Result:

Keyword A - ranks @48 after 24 hours
Keyword B- no ranking within 48 hours
Keyword C- ranks @12 within 24 hours

Conclusion:
It can still help so 5 tacos. Note: My website is DA 2, PA 6