The leek plants that you have are about worthless for food. You are a year late as those are now in their second year. Best that you could have salvaged would have been the seeds to plant back. It would be the leaves and stems for stock but they may be a bit too tough and flavorless.

The part about the tops being edible before curling applies to garlic, not leeks. Leek flower stalks would indeed be edible but only when very young.

Martin