I have s scene with a box converted to VDB fog and I assigned some noise to it.

I want to animate the phase, which I guess is the offset in this case, but I am wondering if there is a way to previze the vdb fog at a low res with the noise to see the animation before render and not using much resources?

You can use the Volume Slice Node or Volume Visualization

Yes, Volume slice seems to be exactly what I needed. Thank you.