Good advice from your tax preparer, who is watching out for your tax brackets. Just carefully check the maturity dates, and don’t cash them in before maturity so you don’t lose out on your interest.
The government will send you a 1099 with the reportable interest on the bond you cash in. You’ll add that to your other income, and it will be taxed at your marginal bracket. So don’t spend it all! And there is no state income tax on the savings bond earnings.