MBP storage

had to transfer some data yesterday for my friend because he needed some space for his external hard drive, so i transferred about 350gb of data into my MBP, now that i have transferred the data back to his hard drive, i don't need it, so i deleted the 350gb of data, but my storage still shows this:

i don't know what to do 😟 its a fairly new MBP, the late 2013 version

can someone help me please? or tell me why? am i going to have the storage back?

thanks so much everyone