Yes, you are correct. If you want to contribute to a Traditional IRA before April 15, 2020, you would have to amend your 2019 tax return to deduct the IRA contribution.
However, you should check if your contributions are limited by your MAGI.
For Roth IRA contributions see: https://www.irs.gov/retirement-plans/amount-of-roth-ira-contributions-that-you-can-make-for-2019
For Traditional IRA contributions if you are covered by a retirement plan at work, see: https://www.irs.gov/retirement-plans/2019-ira-deduction-limits-effect-of-modified-agi-on-deduction-i...
If you are not covered at work see: https://www.irs.gov/retirement-plans/2019-ira-deduction-limits-effect-of-modified-agi-on-deduction-i...
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