In past year’s decision date is last Weds of each month, similar to Georgia Tech. Decisions get posted in geographical waves starting at 4 or 5 in New England with other geographical areas following. They post on social media first then the waves start. Apparantly portal gets updated first and email follows soon after.
On decision day, waves are released hourly on the hour, loosely by geography. Here are some estimated time ranges:
New England: 4-6PM EST
NY: 5-6PM EST
PA, NJ, MD, VA: 6-8PM EST
Southern States: 7-9PM EST
Midwest: 6-9PM EST
West Coast: 8-10PM EST
International: Varies
The above taken from this thread last year, when decisions were first released at 5pm. What to Expect on EA Decision Day 2022 - Colleges and Universities A-Z / Northeastern University - College Confidential Forums