It takes the IRS 20 weeks or longer to process an amended tax return.
You can watch for information here:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
What is the status of the amended tax return on the IRS website - https://www.irs.gov/filing/wheres-my-amended-return