@USM Professor not knowing the full scenario / antecedents, only general answer is possible:
(a) Here is info on estimated payment -- IRS is promoting direct payments ( rather than physical checks ) --->
2025 Form 1040-ES;
(b) If the prop. was used as main home/ residence then depending on meeting the eligibility requirements ( at least one person owning the prop. for 2 years and both filers having the prop. as main residence for a total of 730 days with a look back period of five years from the date of sale closure ) you may be able to exclude up to $250,000 per filer from taxation.
(c) Some states also require estimated tax payment on sale of prop.
Is there more one of us can do for you ?