The irs website, where's my refund changed and it now says, it's being processed. Do I need to worry. 21 days is this Sunday. Shouldn't it say it will be I my bank then?

The 21 days is just a target it is Not a guarantee.

After the tax return has been Accepted by the IRS (meaning only that they received the return) it will be in the Processing mode until the tax refund has been Approved and then an Issue Date will be available on the IRS website.
See this IRS website for federal tax refund FAQ's - https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions

and the IRS does not issue refunds on weekends either.