The best way of checking up on those releases is through your follows list. If there's an rss notice/link on something that then isn't available to read, it won't be on your follows list. When it becomes available, it then appears on your follows list.
Yeah except that the whole reason that I use the RSS feed is so that I DON'T have to keep checking the site multiple times a day.
It also doesn't always arise only in the case of the delay set by policy/uploader. Sometimes when a chapter is brand new, even if it's in the follows list, it'll not actually appear when you go to try and read it. It's been happening this past week with Tomo, for instance.