I didn’t delay. Just disabled them. If I decide to update there are options to chose what to download and what to install and when. Security updates is not downloaded by Windows itself. It’s Windows Defender - build-in antivirus. And yes, it can only be deferred.
Edit: Sorry, I confused with windows 7. It’s been months since I last updated my Windows 10. Looks like we don’t have option to chose updates in windows 10. We can only delay 