How to test if there's any security update missing on an Ubuntu machine without root?

If i’d have root I could run sudo apt update and then apt list --upgradable | grep "\-security" as said here.
But since I don’t have root I can’t run sudo apt update , is there any easy way to do it (other than downloading the list from the Ubuntu site and comparing it to the installed)?

is this for a box or general knowledge? if for a box you can find versions of most things easily with LinPEAS