Determine Pension Withholding using Form W-4P

I'm 73, retired, and married, filing jointly. We have combined income from NO JOBS. Taxable income comes from 1) Pension, 2) Annuity, 3) Social Security, and 4) IRA Required Minimum Distributions. I'm trying to figure if I need to make periodic payments next year and/or apply this year's rebate to next year taxes. None of the instructions for Form W-4P include that scenario. I'm unclear on Form W-4P Step 2b (i and ii).

 

If I have NO JOB, do I consider the income from the highest source as the "job" income not to include in Step 2b(ii)?