That is up to you. As long as the income is reported, you've done your part as the IRS is looking for all income. The 1099 that you should have received is also reported to the IRS, so reporting it was the right thing to do. If you get a 1099 later, no need to do an amendment. You've already reported the amount and if needed, you can explain that later should the IRS try to adjust based on the 1099 they receive. Here's more on 1099's:
https://turbotax.intuit.com/tax-tips/self-employment-taxes/what-happens-when-someone-forgets-to-file...
