Hello,
Visa validity can not exceed the biometric validity period. If biometrics are valid you can still enroll for biometrics while applying for visitor/supervise. However, once you submit the application you can still voluntarily enroll for biometrics and have them update biometrics for your current application. Please see blew.
1. Pay your biometric fee online
2. Upload the receipt through webform (add a document to your application) and explain that you are requesting for BIL (Biometric Instruction Letter)
3 IRCC will send you an automated email within 5 business days and after a couple of days, you will receive BIL on your Visitor application portal account.
Link for online payment/receipt and webform
https://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=1513&top=19
Link: Biometric Validity vs Visa Validity
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/identity-management/biometrics/validity.html