The current list does not include the DIR-2660. It looks like that particular line of routers will not get the firmware fix as of now.

The DIR-1750, 1950, 2150, and L1900 are the only models getting a firmware update. The 1360, 1960, 2640, 2660, 3040, and 3060 will not (as of now).
The AX routers have it already (except X1860 - firmware coming in December 2020).