Usually the way I get it done is: in advance select a leather sample of my choice in terms of thickness and color shade. I matched mine with the plastic shoulder panels on sides of rear seats. He would then take one day to prepare as these are not the standard ready made he has prepared for normal demand which cost half of this job. Those are in lower quality.
After they are prepared you will have to take your car as its a 3-4 hour job for the fitting.
If you could PM me your number or check PM for my number. Would be easier to whatsapp location tag.