I am flying from Ushuaia USH to Buenos Aires and back to the U.S. in early February. I am being told that due to frequent flight delays on domestic flights that I should plan to overnight in BA before taking the international flight home. My preference is to just continue on.

These are the flights I'm considering:
AR 1892 USH-EZE 06FEB 13:33 - 16:58
DL 110 EZE-ATL 06FEB 21:15 - 05:35

Note: there is NO airport change involved. There are 4 hours between the flights.

Is this sufficient time to allow for claiming my bags and checking in on time for the international flight?