macOS Sierra 10.12.3.
OWC Thunderbolt 3 cables are now available, and shipping within a day or two.
OWC Premium Thunderbolt 3 USB-C cables are the perfect choice for your Thunderbolt 3 workflow. These premium quality cables are manufactured to the highest standard to deliver the incredible power of Thunderbolt technology, with models supporting data transfer speeds up to 40Gb/s and power delivery up to 60W and long cable runs.
That's enough throughput to drive two 4K displays simultaneously, or one 5K display. Experience the full high-performance capabilities of your Thunderbolt 3 and USB-C devices.
The cables come in two speeds, with the 40 Gb/sec cables substantially more expensive thn the 20 Gb/sec ones.
Thus it makes sense to use the 0.5 meter 40 Gb/sec cable if the devices is very close to the Mac. If the devices are to be daisy-chained and lack the need for more than 20 Gb/sec (few devices can even approach that speed), then place these last in a daisy-chain, and use the 20 Gb/sec cables.