I am a little bit confused of the hardware table.
Netgear GS108T v3
Unsupported Functions: Ethernet LEDs
21.02.0-rc1 (r16046-59980f7aaf) available
https://firmware-selector.openwrt.org/?version=21.02.0-rc1&target=realtek%2Fgeneric&id=netgear_gs108t-v3
Netgear GS308T v1
nothing about unsupported LEDs
no release candidate can be found for all Netgear GS3
So is it not updated only for the 3-series?
What's confusing about the table? Support for the GS308T v1 got added after 21.02 got branched.
The LEDs on the GS108T v3 will probably be supported in master at some point BTW, I think they already are supported in upstream Linux kernels but not sure if the support is in the 5.10 kernel yet.
I believe the most important difference between those two models is that the GS108Tv3 can be powered by PoE. This is entirely a hardware functionality, so obviously also supported on OpenWrt.
Discussion continues here: Which 8-port switch?