If you want to claim any additional deduction that might result from these amounts then, yes, you'll need to amend your previously-filed 2018 return to claim them.
You can't claim them on next year's return.
Please see the
TurboTax FAQ "How to amend (change or
correct) a return you already filed," below, for instruction on how
to amend your previously-filed tax return.
Please
note, however, that Form 1040X, the Amended Return form you need t amend, isn't yet
available for filing yet. It won't be ready
until 02/22/2019.
https://ttlc.intuit.com/replies/3288565
