Huawei finally started rolling out the EMUI 10 update for the Mate 20 Lite and has it will be download via HiCare app.
The Mate 20 Lite EMUI 10 update size is 4.04 GB, make sure while you download it you have a proper internet connection. The EMUI 10 version for Mate 20 Lite is 10.0.0.148(C432E10R1P1).

Huawei Mate 20 Lite DISPLAY:
Size:
6.3 inches
Colour:
16.7 million colors
Colour Saturation Rate (NTSC):
85% (typical value)TFT LCD (LTPS IPS)
Huawei Mate 20 Lite Resolution:
FHD+ 2340 x 1080, 409 PPI
EMUI 8.2 (Based on Android 8.1)
Huawei Mate 20 Lite MEMORY
SNE-LX1:
4 GB RAM + 64 GB ROM*
SNE-LX2:
4 GB RAM + 64 GB ROM*
SNE-LX3:
4 GB RAM + 64 GB ROM*
Micro SD card slot: support up to 256 GB (non-standard configuration)
Huawei Mate 20 Lite CAMERA
Rear Camera:
20 mega-pixel (colour) + 2 mega-pixel (colour), F/1.8 aperture, supports autofocus (PDAF and contrast focus)
Front Camera:
24 mega-pixel (colour) + 2 mega-pixel (colour), F/2.0 aperture, supports fixed focal length
Huawei Mate 20 Lite BATTERY
3750 mAh*
9 V / 2 A charger.
More EMUI 10 News:
- EMUI 10.0 And Magic UI 3.0: User interface, Performance, Security
- How to download EMUI 10 update on Mate 20 series [10.0.0.154 & 10.0.0.180]
- List of Honor phones to get Magic UI 3.0/EMUI 10