So last year when decisions released in February I was #20. We got an email update on April 20th and I’d moved to #11. On May 4th I requested a status update and was #5. On May 27th they sent out an update to everyone with status and I was #4. On June 6th I was at #3. July 7th I was #2.
They sent out updates in April after the national deadline and at the end of May. All other updates I just sent an email requesting my waitlist status. In May and June I requested them biweekly, by July I started requesting weekly. You can of course request them whenever you want (after they send the first update post deadline).