As a general rule of thumb there is no bad time to apply compost.
When applying compost to your orchard, it comes down to specifics of your situation and can sometimes come down to practical limitations like crop stage, ability to access and availability of machinery but as a general rule of thumb there is no bad time to apply compost.
The good thing about the mineral content of compost is that it won’t be leached, because it’s locked into carbon forms. This means it will be released on demand to the plant roots or microbial activity and you won’t lose it after heavy rain.