My friend buying me a steamdeck from US by logging in to my steam account from there and buying from steam but with my account that is originally located in turkey

My friend buying me a steam deck from US from steam but with my account that is originally located in turkey So my friend will come to my place later this month and ı wanted to buy a steam deck from there because its cheaper and more secure. İnstead of third party sites. İf he logs in to my account from US and then trys to buy a steamdeck directly from steam will it be a issue. Like steam thinking My account is logged from a vpn exc. And lets say if he buys it how long does it take to get delivered to his place.