Lettre type en anglais - Confirmation de travail en cours

Dear [Mr or Mrs or Sirs], We have the pleasure to inform you that work is being carried out in accordance with the proposed plan. We have already completed [...] and currently process with [...]. The [...] should be finished by [date]. We hope that this will give you satisfaction and remain at your disposal for any further information. Yours sincerely [votre nom] [votre fonction]