Most commonly, your dog will come and lick you to show you their affection and trust. As well as grow your bond while licking is also a calming and relaxing activity dogs do for themselves and one another. The key thing is that your dog is choosing to come to you. Otherwise, if you find your dog often licks you mostly during interactions initiated by you, it could be more an appeasing behaviour, potentially.
So with all healthy behaviours toward you, it's definitely best if it's mainly initiated by your dog.