I recieved a letter from IRS cp12 saying that I am owed more money in my tax refund and I was wondering is there a way to check online when I am getting my refund

Check online using the original refund amount before the change ...  https://www.irs.gov/refunds

https://www.irs.gov/individuals/understanding-your-cp12-notice

if this is for UC, at the present time the IRS websites do not reflect the additional refund you are due.  the IRS said they may have something by summer to allow tracking.