Category
Store reports
One store at a time, one region at a time. A store report takes that place's confirmed restocks since tracking began and says what they show: the usual hour, the busiest weekday, the configurations that come back most and how many seconds a listing lasts. Observations, not a schedule; Apple publishes none.
First reports are being written.
Other categories
Alerts
Reading about restocks is slower than hearing about one.
Your stores are checked every 5 seconds, every other store every 15. A confirmed restock reaches your phone in about 3 seconds, with the store and the exact configuration in the title.