For several years, I’ve linked to Apple’s RSS feeds for Downloads. This would allow an automated updated of what updates are available from Apple on the Mac OS, along with link to the update (e.g. Mac OS Combo Updates, iTunes updates, etc.).
Well, on an infrequent update to the Macanix site (backend WP updates, plugins,…), I’ve found that for some time, Apple no longer provides RSS updates that it had.
Now, the only RSS feeds are more for iTunes store, than Mac OS, and Apple products.

Here is a link to Apple’s Downloads that should allow what recent updates are available (until Apple changes this link; note this link is for US…it may be different in your country).