Order of adding ice-candidates to webrtc-connection

MDN documentation for RTCPeerConnection.addIceCandidate() says that it returns a promise.
So an ice-candidate will likely is being processed yet when this methods returns.
I get several ice-candidates from a remote and do not wait – whether addIceCandidate() gets resolved or not.

The question is: should I necessarily wait when the previous promise p = addIceCandidate will be rejected or resolved ? Or it doesn’t matter ?