Is 1065 available for 2024 returns yet?

Yes, you can start entering information in your Turbo Tax Business product now however according to this source, you won't be able to electronic file until 01/17.

You can buy the stand alone do it yourself Business Download program for Windows here (it is not available to do online or for Mac).
https://turbotax.intuit.com/small-business-taxes/cd-download