Yes, you should continue to follow your vet's orders. If those stitches break it's going to cost you more money and prolong the amount of time you need to keep him calm and still.
Now is the PERFECT time to work on foundation training basics that will on the one hand tire him out mentally and on the other pay off massive dividends in the future.
Work on rock solid crate calmness. Down stays. Threshold politeness. Place commands (hang out right here) with distractions. Leash politeness, but indoors right now. Calming training. Food patience. Etc.
There's a lot you can do right now that is safe, massively important, and beneficial for you both.