Ask the shop what is known about assessment and repair scheduling before arranging replacement transportation. An early estimate is not a promised completion date.
Most rental trouble in a repair is not caused by the repair. It is caused by a rental booked against a date that was never a commitment, and then extended at a daily rate nobody agreed to.
What the shop has not published
This site does not state that the shop arranges rentals, refers to a particular rental company, or has any arrangement with one. None of that has been confirmed, so none of it is claimed here.
Ask the shop directly whether it does anything at all on this, and treat the answer as the answer. Do not assume a loaner because other shops have them.
Why the date moves, and what that costs
A repair scope is written from what can be seen. Once panels come off, the scope can change, and parts availability can change with it. That is normal, and it is why a first conversation gives a picture rather than a date.
A rental booked on the early picture is the thing that turns a normal supplement into an expensive week. Ask for the current position each time something changes, and ask the rental company what it costs to extend before you need to.
Ask the rental company
The daily rate, what is included, the deposit, and the vehicle class. What an extension costs and how much notice it needs. What the fuel and mileage terms are. What the return conditions are and what happens if the repair runs past the booking.
If you need a van, a tow vehicle or anything larger than a car, confirm availability early. Class availability is the usual constraint, not price.
Ask your insurer
Whether rental coverage applies to this claim, the daily limit, the total limit, and the number of days. Whether the clock runs from the date of loss, the date the vehicle arrives at the shop, or the date the repair is authorized. These differ between policies and the difference is usually several days.
Whether the insurer pays the rental company directly or reimburses you. Whether a supplement extends the covered days. The shop does not decide any of this, and cannot extend your coverage.
If the vehicle is still drivable
Ask whether it is safe to keep driving while parts are ordered, and whether the shop wants to see it before it goes back on the road. Nothing on this page is a judgement about a specific vehicle.
Driving it in the meantime, where it is safe to do so, is usually the cheapest option available, because it moves the rental days to the part of the job where the vehicle is actually in the shop.
Your questions, answered
Does the shop provide a loaner or a rental?
Nothing has been published about loaners or rental arrangements at this shop, so this page does not say there are any. Ask on the phone.
How long will the repair take?
Nobody can answer that before an inspection, and an early figure is not a commitment. Ask the shop for the current position each time the scope or the parts situation changes.
Who decides how many rental days are covered?
Your insurer, through your policy. Ask about the daily limit, the total limit and when the clock starts, because those three answers decide almost everything.