A home assessment is an admission that it is accepted that the claimants conditions would limit there ability to attend at the Assessment Providers offices.
I would send the information now, you never know it may remove the requirement for a face to face.
Give the assessor a copy of the information on the day to read and ask them to include it in the file that they return to the DWP. They are required by DWP guidance to do this.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems