Got this in the mail last week.
"At this time, we do not have an exact date for when the resorts will reopen, but current estimates reflect the construction process to last until the end of March 2020. We are hopeful that construction will be completed sooner, but are setting realistic timelines based on many unknown factors, including weather and limited resources, which could impact the schedule. Our goal is to welcome you back to Royal Palm Beach Resort and Flamingo Beach Resort as soon as possible, so you can enjoy all that the charming island has to offer.
You can also find monthly updates on DiamondResorts.com under the specific resort pages."