Can copies of my social security and other pension 1099 downloaded into my 2018 return be printed from my return?

No.  TurboTax does not have copies of your SSA1099 or any of your other 1099's.  TT only has the data that you entered from those documents,   You should save those for your own records when you get them at tax time.

You can get a copy of your SSA1099 from Social Security.  Other kinds of 1099's are issued by banks, brokerages, and various other financial institutions from which you can seek copies. 

HOW TO GET SSA-1099

If you cannot find your SSA1099,you can get one from your nearest Social Security office, or there is a way to go on the Social Security website and request one.  Go to www.ssa.gov  You have to create an account with a user name and password.

https://www.ssa.gov/onlineservices/