It's been about 12 weeks or so, right? Usually, flowers would appear about 6 to 10 weeks after planting (depending on type and local conditions). However, there are some varieties that don't flower; they still produce fine potatoes. Perhaps you have one of those types, or they are just delayed a bit in flowering. (Depending on whether you have an early, mid-, or late-season variety, it could take from about 80 to 120 days from planting to harvest.)
Or, sometimes if potatoes get waterlogged or thirsty, or don't have enough sun, they will fail to flower. In this case, they might not produce a good crop. However, your plants are healthy, so it could be they are just a nonflowering type or are a later flowering type.
All you can do is to dig the plant after the foliage has yellowed and died and see what's there. Or, you can gently dig a little bit now with your hands to see if there are any potatoes growing; replace the soil afterward.
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