currently ...ingUsed after a noun or activity stem to say that someone is currently doing something or is in the middle of something. The ending なの adds an explanatory tone and is informal.
Just between you and me, that fat, ugly man is trying to lose weight.
phraseUncommon#12,732
currently ...ing中 indicates that someone is currently in the middle of an activity or state. The ending なの adds an explanatory tone; related forms include 中なんだ and 中なんです.