> It will go online on the testnet tomorrow

It seems rather premature to call it working before it gets properly tested. And three weeks is a woefully short time to test something like this, fix any issues that are found, and then re-test.

The testnet is already online since a few weeks now. But according to the segwit2x timeline this step should come tomorrow if they are still on track:

July 14 - Agreement Participants Install and Test Milestone