I filed my 2019 taxes in February. At this moment the status on my IRS account says ¨Your 2019 Tax Return Has Not Been Processed¨ Should I be concerned?

Unfortunately it has taken the IRS a long time to process refunds this year. The IRS stopped processing returns for some time but has reported started up again. Hopefully your will be processed soon. The only thing you can do is continue to track the status on the IRS tracking web site: https://www.irs.gov/refunds

See this Q&A about the process: https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions