Probably, unless the restaurant is very backed up causing guests to be seated long after their reservation times have passed. That probably won't be the case though since your reservation is near the beginning of the lunch period.
It will all depend upon how you dine at the buffet style restaurants. H&V usually gets you in quickly and your CM will serve the drink order right away after you are seated. Your dining time will be affected by how fast you eat and if you go back for multiple plates of foods. Ordinarily you should be fine with the timing.