Hi, just like
jasonc0408 said you better check it and maybe arrive well before 4 pm.
A friend of mine gave her Biometrics today. I drove her to Service Canada, they didn't ask her time of appointment. Only if she has an appointment or not - all that did matter. Actually, I was there for nearly 40 minutes and no one gave a time of appointment, people were coming and queue up, just saying application number and SC employee confirm if he/she is on the list (big long list actually).
Now important knowledge sharing: The reason I was waiting for my friend for nearly 40 minutes, cause the officer was not able to read her fingers and told her that they can try 5 times only. SC personnel who was providing service said that some people these days have similar issues. This is each person's physiology (fingers) but these days it particularly bad, because of frequent hand sanitizer usage, especially they ask you to sanitize your hand at the entrance to Service Canada. At no point, anyone (SC or me) advising or implying not to Sanitize or Wash your hands frequently. We should do it - to be safe. It's just something (the reality of a current time) to be aware of - it creates some small cracks in fingertips which messes the readability.
Service Canada agent asked my friend if she had a cream (oily cream) to rub on her fingers. Apparently from her experience that helps in similar conditions.
Unfortunately, my friend didn't expect to use cream in the SC office. Then SC rep advised her to rub her forehead or face with the fingers (to borrow some oil from other parts of the body) - it did help.
I know this situation is funny, but when you waiting for an SC call for several months, then an appointment for a few weeks and you are about to fail the scan - she was stressed.