You can know that you are advancing in Krishna consciousness when you desire to become initiated by the bona fide spiritual master.
And the way to distinguish between a real devotee and a fake devotee is to see who is strictly following the Bhagavad-gita exactly as it has been taught by Lord Sri Krishna and who is
just making a show of being a devotee but not strictly following Lord Sri Krishna's teachings.
I hope this meets you in the best of health. Your ever well-wisher,