Visa extension approval

Hi

I have applied for Tier 2 Visa extension I am little bit confused at the end, if somebody please clear me would really appreciate that.

I have submitted the application but haven't applied for biometric yet, would I be receive any approval email first from HomeOffice and then I would have to go for the BioMetric or would it be after the BioMetric, problem is I am getting very late appointment dates from UKVCAS. If somebody please clear this confusion would really appreciate that.

Regards

You have to enrol biometrics first before UKVI start processing your visa application