The Federal Reserve Bank of New York announced that the Secondary Market Corporate Credit Facility (SMCCF) will begin gradual sales of its holdings of corporate bond exchange-traded funds (ETFs) on June 7, consistent with plans announced by the Board of Governors to begin winding down the SMCCF portfolio:
https://www.newyorkfed.org/newsevents/news/markets/2021/20210603
The New York Fed also released a new set of Frequently Asked Questions regarding the sale of these assets.