Fair question. The betting window closes at block 97 of each round, 3 blocks before the draw. Once that block is reached, no more bets are accepted. The draw block hasn't been mined yet at that point, so nobody, including us, knows what the winning number will be.

You can verify this yourself: playtdt.com/live-bets shows every bet placed in the current round in real time, so you can confirm nothing comes in after the cutoff. And every completed round's block height, block hash, and derived winning number are public at playtdt.com/stats, check any of them against a block explorer.