The diet is unlimited hay, one cup of veg per pig per day, up to one tablespoon of pellets per pig per day. Hay is their main food so as long as it is constantly available then you are feeding them enough. Veg is merely a supplementary role in the diet.
How you feed the veg/pellets is up to you!
You can give it in one go as you are, or split it and give half a cup each on the morning, half a cup each in the evening.
I give veg in the evening, along with a hay top up. Mine only get pellets twice a week in summer (three times a week in winter) which is given in the morning if it is a pellet day. Otherwise their morning feed is just hay top up Their hay gets topped up minimum of twice a day (morning and evening) but if I’m home they may get another two top ups during the day if needed