It can be interpreted in a different way too. They are reviewing your docs and based on what has been reviewed so far they do not require any additional doc, but upon further review they might require additional doc(s).
However, all you can do for now is wait until further notice. During my app, I did not follow too closely with terms like IP1, IP2, BG1, etc which is becoming more common in discussions nowadays as I found it difficult to predict my app review stage. Also, the processing sequence is inconsistent from what I observed. There are some people getting PPR in less than 2 months and others waiting longer than a year.
I hope they send you a PPR email very soon.