Would I benefit from a deep plane facelift or should I consider other procedures to target jowls? 32 y/o (photos)

I would consider trying some other things first. have you considered sculptra or radiesse? you might also consider a CO2 laser or RF microneedling. In my experience the results with ultherapy are pretty minimal.

A facelift is used to treat specific issues and is not really age dependent. That said, you would benefit from a mini- deep plane facelift + Renuvion combined with buccal fat pad removal and light fat grafting to the middle 1/3 of your face plus or minus a small chin implant.