Tapo expects to release it within a month. Updates in Matter have been so scarce across vendors that I don’t think there’s even a typical time span.
I would not trust the firmware available in DCL though, assuming it’s even provided by Tapo, and instead would update with the Tapo app.
My understanding is that vendors like Tapo, WiZ or Meross, with cloud products that happen to be Matter compatible, certify “the Matter part” of the firmware (which has its own version), but the whole firmware of the device is another story and may includes fixes not present in what was certified.