Why don't you get a chair specifically for him? At that size - even without the weight - he isn't going to be comfortable with the dimensions of many chairs - too short - seat not wide and deep enough.

https://www.amazon.com/COOSLEEP-Oversized-Electric-Recliner-Breathing/dp/B0CCD6YF5V/ref=asc_df_B0CCD6YF5V/?tag=hyprod-20&linkCode=df0&hvadid=663260361019&hvpos=&hvnetw=g&hvrand=6730969022090301627&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1018222&hvtargid=pla-2189248623744&gclid=EAIaIQobChMIn7To_9G5gQMVl8nICh34VgakEAQYAyABEgI2JfD_BwE&th=1 

It comes in many colors and also has couch and chairs

My husband is 300 pounds and sits exclusively in HIS chair, the biggest electric Catnapper recliner we could find. He very rarely sits anywhere else.

Well, except in the dining room where we have (now nearly antique) Tell City hard rock maple furniture. No issues with those chairs. They’re built like iron and the saleslady said we’d be using them on our 50th wedding anniversary - we celebrated our 49th last week.