It is unknown when the IRS will provide an updated Form 5695. Assume it will be within the next few months.
Check on the IRS website for prior year forms and schedules, enter 5695 in the find box and then click on the Form 5695 for 2018 and there will be a page 2 if updated - https://apps.irs.gov/app/picklist/list/priorFormPublication.html
You have until April 15, 2022 to file a 2018 amended tax return for a tax refund.
