The best I can do is point you to some resources. This is from Wowhead:
This was posted on our site:
https://worldofwarcraft.com/en-us/news/23463732/shadowlands-preview-a-look-at-covenant-systems
Specifically:
Note: If you fall behind or are leveling an alternate character, you’ll be able to earn additional Renown from endgame activities such as dungeons, raids, PvP, and Callings until you’ve reached the current maximum.