To know which packages are supported and which are not, for how long and whether the community or canonical are the ones who support it, just run:

ubuntu-support-status

It will give you this sample output:

Support status summary of '$HOSTNAME':

You have 211 packages (15.4%) supported until April 2021 (Community - 3y)
You have 1431 packages (74.0%) supported until April 2023 (Canonical - 5y)
You have 2 packages (0.1%) supported until April 2021 (Canonical - 3y)
You have 2 packages (0.1%) supported until January 2019 (Community - 9m)

You have 24 packages (0.9%) that can not/no-longer be downloaded
You have 254 packages (9.5%) that are unsupported


Run with --show-unsupported, --show-supported or --show-all to see more details

To get more detailed info, add –show-unsupported, –show-supported or –show-all. You could of course use grep to help in filtering.