No. Metzee has no locker network and no third-party collection points. There is nothing to select at checkout and no partner shops.
That is a clean no rather than a "not yet in your area", and it is worth saying plainly so you do not go looking.
What does exist
The seller's own pickup point. Where a store offers collection, they have given an address — their shop, their market stall, their home, a relative's counter — with days and hours they will be there.
That is a real place with a real person, not a locker. You turn up during their stated hours, show your pickup code, and take the item. How to collect an order
Why that is better than a locker for this
Worth saying, because a locker sounds more convenient:
You can look at the item before you accept it. You are standing in front of the thing you bought, with the seller, and the payment is still protected. If something is wrong you say so then and there, and almost every seller sorts it out on the spot.
A locker gives you a sealed box and no recourse until you have opened it at home. For second-hand and handmade goods — most of what sells here — being able to inspect at handover is worth more than being able to collect at midnight.
What you can do instead
Deliver to an address where somebody is in. An office, a shop you know, a relative. The address does not have to be your home — it has to be somewhere a courier can reach a person. Can I change my delivery address?
Hold it at the courier's hub. Not a Metzee feature, but many couriers will hold a parcel for collection if you call them with the tracking number. That is their service and worth asking about if you are never home. Nobody was home for the delivery
Ask the seller to use a delivery note. Where it is offered, "leave with the watchman" or "call when you arrive" saves most failed attempts.
If you are a seller reading this
Your pickup point is the closest thing to this, and it is underused. A store with a collectable address gets buyers who cannot take deliveries at home and buyers who want to see the thing first — and it costs you no courier and no packaging. How to offer pickup
More: how pickup works, where exactly do I collect from, what pickup only means.