There's no part on youtube (that I know of) that says if a channel has uploaded a new video. Although what I think could work, is to parse the videos section of a channel, and extract the title of the latest video, then use a measure to compare it to the latest title each time it parsed it, and do something if that titile changed. Could work ![Confused :???:]()
I haven't inspected the site since i'm on my phone, but this is the page I'm talking about: https://m.youtube.com/@MrBeast/videos
It even displays the latest video's "date".
Edit.
Looks like "publishedTimeText":{"simpleText":"hace 7 días"} could help (mine is in Spanish tho, but it says "7 days ago.").

I haven't inspected the site since i'm on my phone, but this is the page I'm talking about: https://m.youtube.com/@MrBeast/videos
It even displays the latest video's "date".
Edit.
Looks like "publishedTimeText":{"simpleText":"hace 7 días"} could help (mine is in Spanish tho, but it says "7 days ago.").
Statistics: Posted by RicardoTM — Yesterday, 11:15 pm