Amended Return Help

Hi! I have had trouble finding an answer online for this. When filing my original return, I mistakenly calculated capital gains which resulted in a federal tax bill of over $17k. However, when correcting this on an amended return, we should receive a refund of approx. $3000. I am worried the amended return will not reflect until after taxes are due (we filed the amended return over a month ago and it's still not even showing up on the IRS amended site), should we pay the $17k now? Or wait? Thank you!