BRP Collection

In-country Skilled Worker Visa application timelines:
1. Type of application: Switching to Skilled Worker
2. If switching, category changing (switching) from Skilled Worker Dependant
3. Service used: Super priority (GBP 800)
4. Date of expiry of current leave: 16 December 2022
5. Number of dependants applying at the same time: 2
6. Date application submitted online: 01 February 2022
7. Date of biometrics enrolment at UKVCAS: 10 February 2022
8. Payment mode : Online
9. Date of approval: 11 February 2022 (Hopefully, considering super-priority)

Questions related to new BRP card:
a. Please suggest how many days this will take ?
b. Super priority fee has something to do in the BRP collection timings as well ?
c. BRP need to be collected by self OR it will be posted to my address in UK ?
d. Without collection it is not advisable to leave the country ?
e. Old BRP card will be kept by the UKVI authorities ? Or will be provided back to me ?

From what I know:
c) Posted.
d) Yes.
e) I think you'll have to cut it up and send to a certain address, so first option.

a. Usually it should arrive within 1 week of receiving approval email depending on where you live. TNT/Fedex delivers it.
b. No. Super priority only speeds up visa approval. Sometimes even priority will give you next day approval and save you £300 (my experience, not guaranteed).