heinekenregatta.com/schedule
Scroll down for the day-by-day 2019 schedule
That does indicate what you stated, although there is also the following disclaimer on the same page.
Have a look at the event schedule of the 39th St. Maarten Heineken Regatta. Please bear in mind that the items are subject to change.
I guess we will find out for sure when it is closer to time. This would be very early to announce the schedule compared to what they have done in the past but it may well be the case.