I’d say about a third of the bottom leaves are brown plus the plants are falling over.
That’s what made me think that they’re about ready.
I would say dig them tomorrow and let them dry in the field or in fence but dry them on a porch or sheltered place if you get summer showers. You should record the date for reference next year and on as I suspect you are a little late. I have a spiral notebook in my shed that I record date planted, date harvested and the size and condition of the bulbs and wrappers...