The Fed said https://www.reuters.com/business/with-bond-buying-taper-bag-fed-turns-wary-eye-inflation-2021-11-03 earlier this month it will buy $70 billion of Treasuries and $35 billion of mortgage-backed securities per month starting on Monday, a pace that will drop to $60 billion of Treasuries and $30 billion of MBS per month in mid-December.
The schedule for Treasury purchases can be found here https://www.newyorkfed.org/markets/domestic-market-operations/monetary-policy-implementation/treasury-securities/treasury-securities-operational-details and the schedule for MBS purchases can be found here https://www.newyorkfed.org/markets/ambs_operation_schedule.
Source: Economy - investing.com
