On July 10, 2020, in Cargo Systems Messaging Service (CSMS) #43325051, U.S. Customs and Border Protection (CBP) published guidance on filing quota entries under the United States-Mexico-Canada Agreement (USMCA). This guidance includes Special Program Indicator (SPI) information, limits, and tariff numbers.
CSMS #43325051 can be found here:
https://content.govdelivery.com/bulletins/gd/USDHSCBP-295167b?wgt_ref=USDHSCBP_WIDGET_2
The guidance can be found here:
https://www.cbp.gov/trade/quota/bulletins/qb-20-111-usmca-quota-action-facts