2024 tax return still not processed

I mailed my paper federal tax return in March 2025, but my IRS account still shows "Your 2024 Tax Return Is Not Processed." When I check my refund status, it says "Refund status unavailable." All I know is that the IRS cashed my check in March. I need my 2024 tax transcript for immigration purposes. What should I do? I tried calling (800) 829-1040, but it's always an automated voice system, and I can't reach a real person.