They've got a serious breakout of Covid on Ambergris Caye and they are in complete lockdown on the island. There are a couple of other areas in lockdown too, I believe.
Could be many months, depending upon how good everyone is about the lockdown. Photos I'm seeing suggest that everyone is being good. They want this to end, many are starving. Businesses have gone out of business and won't be reopening or if they do, it'll be under new owners.
Doesn't sound like this is boding well for a 9/3 opening