I’m going to assume that you’ve heard that the number is $600B in expansion, putting the total amount of purchases including reinvestment at just shy of $1T. Here are some excerpts from the official statement that are more interesting, as well as my emphasis added in bold:
Purchases associated with balance sheet expansion and those associated with principal reinvestments will be consolidated into one set of operations to be announced under the current monthly cycle. On or around the eighth business day of each month, the Desk will publish a tentative schedule of purchase operations expected to take place through the middle of the following month, as well as the anticipated total amount of purchases to be conducted over that period. The schedule will include a list of operation dates, settlement dates, security types to be purchased (nominal coupons or TIPS), the maturity date range of eligible issues, and an expected range for the size of each operation.
The Desk expects to conduct the November 4 and November 8 purchase operations that were announced on October 13, and it plans to publish its first consolidated monthly schedule on November 10 at 2:00 p.m.
Purchases will be conducted with the Federal Reserve’s primary dealers through a series of competitive auctions operated through the Desk’s FedTrade system. Consistent with current practices, the results of each operation will be published on the Federal Reserve Bank of New York’s website shortly after each purchase operation has concluded. In order to ensure the transparency of our purchase operations, the Desk will also begin to publish information on the prices paid in individual operations at the end of each monthly calendar period, coinciding with the release of the next period’s schedule.
Note that this means that much more out-of-sample prediction may be possible in the future for POMO, both due to better prospective data release and higher detail in released training data.