Estimated Taxes with New Job

I assist my son in filing his taxes using Turbotax. For his 2023 returns, he was a full-time student who had additional income from a part-time job and a few financial accounts.  In the past,  because of investment income, he made estimated tax payments. But for 2023, he received refunds on his federal and state returns, primarily due to education credits. He is finishing graduate school soon and will start a full-time job during the last week in June. He is single with no dependents. We need help in determining what estimated taxes, if any, he should pay beginning in June. How would you recommend we go about determining this and making the necessary calculations?  Can we use Turbotax to help?