A strike date has been set, for 60,000 failm and television workers, Monday, 2021-10-18. I haven’t seen anything about boycotts yet. Update, 2021-10-16: a tentative agreement was reached, averting the scheduled strike.

Per Wikipedia, the strike started 2021-10-05 and is ongoing. A spokesperson for the BCTGM union wrote that there has been no formal declaration of a boycott, but: “supporters and consumers could certainly support the Kellogg workers and their fight for a fair contract by choosing NOT to buy Kellogg cereals while the strike is ongoing.”

Per Wikipedia, the strike lasted from 2021-07-05 to 2021-07-23.