According to some owners of Nokia 7 Plus, a new software update is available for this great phone. This update seems to be a new build of Android Pie marked as V3.39B, which probably brings the much-needed optimization of Android Pie. It is 462.8 MB large so the download should be much faster. Anyway, the update is still not available for my Nokia 7 plus, and it seems that HMD released it for the Indian market first.
Do tell us if you got the update (mention where are you from), and how the installation went.
Thanks Abhijeet Parsekar for the tip.