I'm looking for an update on my 2018 taxes, when will I receive my refund?

2018 taxes should have already been refunded.   go to the IRS website and see if they have a transcript of your return. if not, they never got it. Refile by mail and use a method where you get proof of delivery.  if they have it,  does it show a refund?  if so, use this link

https://ttlc.intuit.com/community/refunds/help/how-do-i-replace-a-lost-or-damaged-tax-refund-check/00/26320