Episodes 3 and 12 of the Inside The Yale Admissions Office podcast talk about Covid, the impact, and their process: https://admissions.yale.edu/podcast
Same with the Tulane Admissions blog. As with MIT, I'm linking the whole blog because several of the articles are on point: http://tuadmissionjeff.blogspot.com/
Our own /u/UVADeanJ commented on this thread too, but her blog is also excellent. http://uvaapplication.blogspot.com/ She's got articles about how Covid has impacted GPAs, SAT & test optionality, their evaluation process, and more.