if you're halfway through core 2k and don't feel absolutely horrible, you don't need rtk: you're capable of remembering the kanji within words.
#rtk as beginner?
candid cave
the current recommendation is to use RTK if you did it all right with JP1K or Kaishi or Core deck while reading a lot, but after a month or so you still can't diffirentiate kanjis and each anki session is hell.
boreal turtle
It's generally not recommended since you can learn kanji in context just through reading, there's no need to do individual kanji study
Plus, assuming you're talking about actually remembering their writing as well, that's a lot to be doing as a beginner for sure, especially since you can't recognize/read them yet, and you could be spending that extra time reading and getting great recognition of many many kanji
violet lotus
I think it's very worth while learning the basics of kanji.
Helpful things (I think)
Learn the radicals and how to write them (taught in the RTK book)
Learn the common stroke order rules (taught in the RTK book)
Learn how kanji work (one part is generally the meaning and the other part is generally the reading)
With that knowledge you'll be able to go back and use it as a way to help you learn words you're having trouble remembering. Ex. All of these kanji share their reading because they all share the same reading component 検 験 険 倹 剣 you don't need to memorize every single kanji's meaning and reading components but it's worth doing on a case by case basis, seeing why a word has the meaning it does or why a word has the reading it does.
Stuff that's not worth learning
How to write kanji from memory
Memorizing all of the readings for kanji in isolation (as mentioned above only actively study these if you're having issues remembering words)
Kanji meanings in isolation (I will die on this hill but this is literally the most useless skill in Japanese. Knowing kanji meanings has literally 0 application don't @ me)