So does every Tumblr blog! Just add /RSS to the end of the URL in question. This also works in conjunction with other link modifiers like tags so for example if you want to follow an artist on Tumblr and only see their work and not anything they reblog, or you only want to see stuff from a certain fandom.

Keep in mind that this only works with blog links that look like [blog].Tumblr.com or [blog].com, not tumblr.com/[blog]. it also doesn't capture tags which is kinda half of tumblr's main form of interaction, but I think if you're interested in that you're the sort of person who actually uses Tumblr and doesn't just want to keep tabs on one or two artists you really like. Then again that could actually just be an interface thing and an actual RSS feed reader would show them as opposed to my kinda jank thunderbird setup

(I think you can also do this the other way around and turn RSS feed updates into Tumblr posts using like IFTTT, but I have questions for you if you're doing that for something that isn't an update blog)

...or you could wait and see if automattic ever does good on their promise to add activitypub integration into Tumblr.

Also on the subject of Tumblr adjacent things, ao3 also has an RSS feed button. For both authors, fics, and tags. Haven't used it in years but it still works according to the random author updates I get.