How many weeks does it usually take for the effects of square jaw Botox to appear?

I enjoy eating chewy foods, which has caused my jaw muscles to develop, making my face look angular and my impression appear dull. Even using makeup for shading has its limits, so I am considering getting injection treatments at a dermatology clinic to tone down my jaw muscles. I am very curious to know when I will start seeing slimming changes before I receive the treatment.

Typically, how many weeks after the procedure does the effect of square jaw Botox start to become clearly visible? I am curious if the results appear immediately after the injection, or if the muscles gradually soften and shrink over a period of about 2 to 4 weeks. I would appreciate it if those who have personally experienced square jaw Botox could share their firsthand stories and advice on whether the contouring changes are noticeable.