I'm not quite sure what the lightest is... but I had a 2020 fox 34 factory that was incredibly light considering how good of a performer it was. The true light weight forks seem to be max 120 these days (sid ultimate). However the fox 34 factory, especially the 2020 fit 4 damper with the smaller damper shaft, are light as hell.
My 140 "26er" Lefty weighs the same at 1344g (well, mine is 1348 g).... For a 29er you add 2 x 10mm spacers and it is a 120mm travel 29er. Even the new (only 100mm) Ocho is heavier.
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