Can i go back to verify all income was entered, as suggested on the stimulus check inquiry screen?

Yes, click the "Wages & Income" tab at the top of your page.  That will bring up the summary page for your income entries.  You are ensuring first that there is an entry for each income source (W2 for jobs and 1099 and or cash for self-employment).  You are also then verifying the income entered matches the forms you have (W2, 1099).