There is many 1.17 feature mods for 1.12.2, 1.15.2 & 1.16.3 already if you want to try some out (2 for Caves and Cliffs blocks, 1 for Axolotls, 1 for the Sculk Sensor and more will probably appear over time or those mods will be updated).
I've reviewed a few of them if you want to check them out here are the videos on them (the link to the mods are in the descriptions).
But no snapshots/pre-releases/release candiates until 1.16.4 is done (which only has a pre-release so far) and the update itself is coming out next year so we might see snapshots around December/January I think.
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