For most people the question with phosphorus isn't whether they get enough, it's that it's already almost everywhere in the diet. It works alongside calcium to build and maintain strong bones and teeth, and helps your cells produce and use energy.
Real shortfalls are uncommon precisely because it's so widespread. It's naturally in protein-rich foods like meat, fish, dairy, eggs, nuts, and legumes, and it's also added to a great deal of processed food and dark cola-type soft drinks as a phosphate additive, which pushes many people's intake up without them noticing.
So the more useful number here is the ceiling. Adults need around 600 mg a day, which most diets clear comfortably, and it's best not to exceed 4,000 mg daily. Staying well under that matters most for anyone with reduced kidney function, since the kidneys clear excess phosphorus, so it's worth checking with a doctor if that applies to you.