I think the first chipbatches will arrive in some months. And in this month avalon will provide a free miner design. That means its possible that no developers are needed at all to create a miner. But the miners created by the developers can only be tested once they can run the miner with a chip to test it out. In 4 weeks test-chips are sent out so that miner-developers can test their miner.

What i mean... it takes some time until the chips arrive anyway. And when they arrive the miners will be ready to be created. A ETA isnt needed because of that i think.

But maybe i misunderstood you.