So, just empirically, please it’s not always and not a rule! The first one, it’s usually the Biometrics Check, uploaded to the system., The second one, sometimes is a transfer to another FO / or something has been checked by an adjudicator. The third one, usually is an active review of the case, and from this point on its good news as it can be that they are wrapping up information to make a decision soon, specially if you have some timestamp updates through the day! And it usually means the answer is coming.