The LG G7 ThinQ will reportedly have access to an official, stable update to Pie (Android 9.0) in the first quarter of 2019. This is according to a Korean-language document that appears to be a company roadmap for the software updates to come for the OEM's most recent flagships in 2019.
https://www.notebookcheck.net/LG-G7-ThinQ-now-rumored-to-receive-update-to-Android-9-0-in-early-2019.387901.0.html