Not complicated....for smaller locations talk to them the day before....and they will probably have whatever you need when your transfer arrives the following day. That's how they make their money.
This is a good suggestion...if you are close enough to go there and are willing to wait in line to be sure you will be able to go the next day to wait in line again but at least be able to get the money.
You coud also go ahead and make the transfer and then, if they don't have the funds available that day, make the arrangements to get the money on the following day...if not a few hours later on the same day.
My first two transfers (sent by my sister in law in November of 2019 and January of 2020) were fairly large (about $1000USD when the rate was $72 ARS to one USD) and I needed to pick up the funds in Bahia Blanca. There are several WU agencies there, but only local one handles the larger transfers.
I arrived about 9am.They didn't have enough funds availble but they said thay would by noon. I returned at 11:30 and was asked to take a seat (without waiting in line). While I was waiting, a young man entered carrying two large satchels which I assume contained currency.
A few minutes later I was granted access to the secure area where I was given $72,000, all in $100 pesos notes.
I then walkd three blocks to the bank, paid my credit card balance and deposited the rest of the money.
I repeated this the following month.
After that, now over two years ago, I began making on line WU transfers to my bank account and eliminated the need top spend half a day driving to Bahia Blanca to pick up and deposit the funds.
I only made one transfer to Punta Alta to get pesos at a kiosk. That was a little over a year ago. I needed about $35K to pay my mechanic for replacing the piston rings in my Peugeot 405. The kiosk did not have enough pesos on hand at 10 am, but they did by noon.
PS: I get pesos using my debit card at the YPF station when I buy nafta (which I pay for with my credit card). I no longer have to got to the bank for any reason, or even use an ATM.