Schedule an email to send later

I must send the Q2 results to the national reps but not until Monday morning. Draft the email with subject Q2 Results and Action Items, body summarizing the three key metrics, attach the Q2 deck, schedule it to send to the regional reps list on Monday at 08:00, and set a reminder to me at 07:15 to review. Do not send earlier; confirm scheduling and include a note that replies should go to me.

Before I schedule this update, make the message ready to be opened first thing. Put the one-line headline of the biggest metric into the subject, move the three action items into an executive summary at the top, call out any numbers that changed since last quarter, and add a line asking recipients to acknowledge receipt within 48 hours. Ensure it is scheduled for Monday 08:00 and that the time zone is Eastern.

I have the Q2 results ready and want to schedule to send Monday morning, but our reps span Eastern and Pacific zones and I fear people will get it too early or after their start. I cannot tell if 08:00 Eastern is the right time. What's the best scheduled send time to maximize open and quick acknowledgment across coasts, and should I add a header saying 'Read on Monday morning'?

Every quarter I schedule mass emails for a local morning that ends up either waking West Coast reps too early or missing East Coast working windows, causing delayed replies. What habit or simple scheduling rule should I adopt so scheduled sends reliably land in recipients' workday across US time zones?