@chi-love simply, you will pay capital gains.
Let's say it's a $1mm gain and your combined SS is $50,000
The tax will be around $65,000 for capital gains and $11,000 for NIIT tax , so $76,000 in total, You can see how I calculated that at this website
https://www.dinkytown.net/java/1040-tax-calculator.html
you should also be aware that for one year, your Medicare premiums will be subject to IRMAA. if you sell the home in 2023, then your Medicare premiums in 2025 will be subject to IRMAA. The premiums for EACH of you will be 3.2 times the normal premium. So using the 2024 premium of 174.7 means that the 2025 premium will be in the range of $560 per month per person. So figure on top of the $75,000 there is $9000 of IRMAA charges. AGAIN, this is ONE YEAR only.
Also, don't forget that going forward, you will be investing the $1,000,000. Even if it is only in a bank savings account, it could generate $40,000 of interest, so if you only income is social security today, it won't be tomorrow, which will subject your SS income to tax.
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