normally, regular extensions are added to the website within a day or 2.. extensions that require testing take much longer till they are added to the website
new extensions are usually added tat the end of their category page unless related to another extension, it will then be added after the other extension
some extensions are available on the sf repository before they are available on the website because website needs editing the page etc
to find the latest extension or an updated one, check the project page:
new or updated ones will be listed first
usually on sf project websites the downloads are linked back to the repository where they are monitored for download statistics but for convenience of users and because most files are small and don't really need mirror management, the files are uploaded and linked directly on the kmext website and not the project page so users don't need to go through the sf download manager.