My sugarcat Bob has always gotten fed canned twice a day. Before diagnosis, when he was eating dry, we'd leave some in a bowl all day and he'd graze at will. (he 'willed" a lot apparently, because he topped out at 20 pounds, which probably had a great deal to do with his eventual illness). Now he weighs 14 lbs.
Since ditching the dry, I feed him at 6am and 6pm right after I test him. Right after he eats, he gets his insulin (if he needs a shot). Occasionally, I'll swing by the house during the day and give him an ounce or two as a snack, but I always do so pre-nadir. If I feed him a snack too close to the next test, his BG is higher for the test, which can lead to too high a dose at shot time.
If you are going to be doing home testing and treating, at some point you'll do a "curve" on him and see when his BG is the lowest and highest. Assuming it's about half-way between tests as it usually is with a long-lasting insulin, then you can probably keep on the way you have with two meals a day, and possibly toss in a snack before his BG goes to its low point.
Carl in SC