Google has just added the LG Aristo 3+ with Android 9.0 Pie to the Android Enterprise Solutions Directory
The LG Aristo 3 plus from Metro By T-mobile comes with Android™ 8.1 Oreo out of the box. The official model name for LG Aristo 3+ is LMX220MB.
The LG Aristo 3 which has the model name LMX220MA was spotted in Android Enterprise Solutions Directory too.
Maybe LG will release the Android 9.0 Pie Update for the LG Aristo 3 plus LMX220MB and LG Aristo 3 LMX220MA.