The government is taking no chances with the reopening tonight of 29 casinos at the stroke of midnight. It is conducting thorough checks of all playing areas to ensure sterilization measures have been taken and procedures are being followed to minimize the chance of a COVID-19 outbreak. See these informative videos from the DICJ for evidence of this heightened vigilance at the floor level.
The government released a number of measures last night, which are principally aimed at protecting players and gaming staff from cross-infection. Chief of these are that tables must have at least one chair empty between players at all times, and no one will be allowed to stand next to or behind the players seated at the table. Dealers must wear facemasks.
Moreover, only half of all gaming tables in a casino may be open and staffed at any given time. This is unlikely to be a problem for the foreseeable future, as the central government has not yet resumed the IVS visa system, nor allowed the resumption of tour groups to Macau.
A total of 12 casinos have applied to open at a later date. They include: Sands Cotai Central (which is under renovation anyway), Waldo, President, Altira, and some smaller casinos. All the major properties in Cotai will reopen tonight.