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There is no ideal weight/age guide. All piggies come in different shapes and sizes and a weight which is good for one piggy, isn’t good for another. Therefore, their heft is the helpful guide - if you can feel their ribs with a nice fat layer over them, then they are likely healthy. If the ribs protrude, then underweight. If you can’t feel ribs at all, then overweight. Weight - Monitoring and Management
Ensure your piggy has a good amount of exercise and is fed mostly hay, 50g of veg per day and just one tablespoon of pellets per day.
2.4lbs is just over 1kg
I can say that at roughly that age, my two boars were 860g and 970g but as I said, all piggies come in different shapes and sizes. They are both now around 1.35kg and are 2.5 years old.