となっております

is

→ と
phrase Rare #40,025
is A very polite, formal customer-service expression meaning that something is or is currently the case. It can sound indirect or more formal than simply です.
JA: こちらの席は予約席となっております。
EN: These seats are reserved.

ただいま品切れとなっております

I'm sorry, but it's currently out of stock.

お客様こちらは禁煙となっております

This is a non-smoking seat, sir/madam.

商品お届け玄関先までとなっております

Your order will be delivered to your doorstep.