Those notifiers would not tell you when there are enough chunks ready for HLS playback, which is 3. By default, Wowza tries to create 10 second chunks (but the actual size depends on key frames because chunks can only be broken on key frames). You can reduce the time it takes for a stream to be ready by making making key frame frequency 1 or 2 seconds on the encoder side, and
setting cupertinoChunkDurationTarget 1000 or 2000. For example a stream with 2 second key frame interval and cupertinoChunkDurationTarget set to 2000, Wowza will make 2 second chunks.