@melting-sky Yeah it's exactly that, normally each catch up should last for a month but usually they're a bit longer sometimes going on for multiple months.
To know what's on catch up you can either look on the forum for a post like this one:
https://forums.j-novel.club/topic/2795/stock-up-on-fantasy-in-december-s-catchups
or you can look in the news section at the bottom of the front page of the main site (which is, in my opinion, the easiest way since catchup content is, with new license announcements, the only info put there).