We just got our biometrics request today!!! I'm wondering the same thing now - whether the biometrics and medical request follow closely to one another. We are currently in northern Italy and there's no regional travel allowed due to COVID; the closest place we can get my husband's biometrics done is in Rome... and there are only three places for approved Panel Physicians here (Rome or Milan) so we also have to do some travelling in order to get it done. I think we are just going to go ahead and get the biometrics done ASAP once we're able to travel regionally because we don't want to delay our application review. I don't know if they need to approve the biometrics before moving onto other stages of the application review, such as the medical examination.
Also, I saw your question about updating info on your application - address, contact etc. We also had a change of address and employment... I didn't know how to make an update without an application number, but we finally have that now! How did you go about making your updates? Through the webform?
So many questions, haha