That hoof is cleaned out and I can stick a hoof pick in that crack id say a good inch.
Haven't smelled it so don't know if it stinks.
As far as needing a trim don't know when that will happen can't find a farrier. I sure can't trim him iv been hurting to bad.
You're dealing with deep sulci thrush
An FYI is that deep sulci thrush does not always have an odor to it, which is why it so often gets missed by vets and farriers
Treating the hooves is a lot more time-consuming and grueling than it is expensive.
If you live in dairy cow country, your local Co-Op, feed store, or Tractor Supply should carry either dry cow treatments called "ToMorrow" or "ToDay". Folks that have used both say "ToMorrow" works better. I have only used ToMorrow and it is the magic bullet.
If you're able to bring him in at night, you would have to put some shavings down in the stall and keep clean shavings in there.
You would have to soak his hooves either with a mix of warm water and betadyne, or warm water and Hibiclens (sp?). I think drug stores also carry Hibiclens.
A lady on another forum invented a most fantastic idea for soaking all four hooves at once:
She wallpapered the outside of (4) gallon-sized ziplock bags so they wouldn't tear, put enough of the water/mix in the bag to cover the hooves, then duct taped the bags around the horse's legs.
That poor horse had the most pitiful look on his face but,Love Him, he stood quietly for the time she soaked him.
She patted the hooves dry with paper towels, shot the ToMorrow into the sulci, then made a 50-50 past of diaper rash cream and triple antibiotic ointment to put over top of the ToMorrow to hold it in (ToMorrow is liquid and won't stay in the sulci on its own).
She then put him in a temporary pipe panel stall with temporary grid mats and shavings, in her barn. The improvement in those frogs in 48 hours was amazing.
The mud, along with all that manure mixed in, and the hooves not having a chance to dry out is what's causing all the problems.
If you can get the horse up at night on a dry floor and do the treatments, he won't heal over night but he will heal.
That is very painful for him and not prudent to ride him as it can be so painful he might try and buck you off, once his hooves have had all they can tolerate