Yes it is profitable.  Will it be in the future.  Don't know.  ROI for me is 11 months left if prices stay stable and difficulty increase doesn't spike like it did dec. - mar.  2018.   

If the price goes up to 11-13k.  7-8 months.

If you haven't bought a miner yet.  Don't.  It's risky. 

Take the l3+ mining stats
December 2.5 LTC
March 1.6 LTC

I expect my L3+ to make less than .4 LTC per month by December 2018. 

At today's prices thats just a little over the electricity usage.  $57 (at a .10 kWh rate)

If it goes down below $140 and stays there till december.  well....poop.