Quick biometric question 5 day rule.

Hello! Tomorrow is the big day we send in our application and set up biometrics! Just making sure that everything must be sent 5 days from the actual biometrics being taken not printed. I feel I know this but OCD kicking in! Lol

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Yes, it's 5 days from the biometrics.

See here:
https://www.gov.uk/government/publications/usa-apply-for-a-uk-visa/apply-for-a-uk-visa-in-the-usa

From that page:

3. Post your application
Your biometric confirmation receipt will be stamped at your appointment. You then have 5 days to post this, your application form, your passport and supporting documents to UK Visas and Immigration (UKVI). All applications must be accompanied by a valid passport with at least one page without any endorsements. If the application arrives at the decision making centre without a passport the application will be refused.