On Twitter Samsung says that there will be 4 years of minimum updates. This is for phones from 2019 it accounts the S10's to the S21's heres the link:
Yes! I was so excited when I heard the news myself....giving 4 yrs of security updates even outdoes what Google offers for their Pixel phones!
*if I have helped you, please LIKE this post. If I have helped solve your problem, please mark this as a SOLUTION. Hope you have a great day!