The "hole" you see is partly the frog disengaging and readying to shed on its own, now very overgrown.
That is also the off-color and appearance of swiss cheese you have happening.
Um... the deep dark crevice shown in your picture though is thrush happening...welcome to summer in Florida weather.
Call your farrier and ask them what products they recommend for your horse and will they teach you how and where to apply that product for best results.
You want to get ahead of any bacterial infection which is what thrush is before it sets up not only house but a mansion of bacteria in those feet.
I use ThrushBuster pro-actively this time of the year so I don't get a problem.
ThrushBuster is purple in color applied and stains anything it touches.
It is a product with venetian oil {?} which is what makes it work so well.
It will kill bacteria harming and leave other hoof tissue alone where many products kill all tissue touched, not always what you want honestly.
The product only needs to be applied when all the purple coloring has faded, then it has lost its effectiveness and it stays working even in wet conditions, something needed down here with daily thunderstorms we have.
For my horses, in my paddock and footing...that is 2x a week is all that is needed.
Call or text the farrier, send the picture to them and ask what you need on hand for them to help you help the horse.
My horses and those of my friends are all on 5 week trim schedules this time of year as feet are growing faster so more care is truly needed.
My horses actually are year-round on 5 week schedules as they grow good amounts of hoof.
My friends are on 6 week but never longer as angles change and no one is wanting to add additional stress to hoof or leg structures = injuries.
I don't know what your schedule is for trims but if you are going past 6 weeks with the jumping, deeper sand rings we all have with Florida sand you might want to reevaluate that honestly.
Final comment is, the frog shedding is what you see and hooves need attention now, not in 10 days time.

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