The waiting time was a lot and now the developers have compiled the Lineage Os 15 ROM for Moto E 1st generation, an update with android 8.0 Oreo, but if you are anxious to install the ROM you just have to meet certain requirements that are of utmost importance.
Having your Moto E bootloader unlocked as well as having Recovery TWRP installed, if you don't know how to do these processes, don't worry in less than 10 minutes you can do it, we share the method
Unlock bootloader Install TWRP
Since you have met the appropriate requirements now you just have to download the ROM and GAPPS and the links are direct from the developer
ROM Lineage Os 15 Android 8.0 Moto E
Once you have the files downloaded, you must transfer them to the Micro SD memory of your Moto G4 E 1st Generation
Now we only share the video tutorial on how to install Android 8.0