A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. If you choose to bring a letter of invitation or Affidavit of Support to your interview, please remember it is not one of the factors used in determining whether to issue or deny the visa.
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An invitation letter is not mandatory. In fact, you can submit the form without a letter. But it can smooth the entire process. Obtaining a U.S. visa is challenging, with the USCIS adopting strict measures and the high number of applicants.
If you are in the United Kingdom, you may schedule an appointment to apply for a visa at either post regardless of your nationality or status in the United Kingdom. If you are eligible to apply for a visa by courier, and you are in England, Scotland or Wales you should submit your application to the Embassy in London.
Visa processing takes approximately 21 workdays from the date on which the application is received by the Embassy. A further 2-3 workdays should be allowed for the return of your passport.