There is now available an uncut video tape recording which contains Elvis in Concert tv special including nationwide and local commercials too, as it was broadcasted on October 3rd, 1977 by KFMB Channel 8, which was CBS affiliate in San Diego, California. So yes, it is so interesting to see that Maybelline was one of nationwide advertisers and Bank of America one of local San Diego advertisers. The main sponsor for this tv special seems to be Chevrolet.
The biggest surprise to me was that CBS' Young Dan'l Boone tv series promoted Elvis in Concert tv special, because it proves that CBS has put some extra promotion regarding Elvis' tv special!
Here is a link to CBS special presentation: https://www.youtube.com/watch?v=SOZp8154MK8&t=4s
P.S. According to IMDb there were eight episodes made but only four episodes of Young Dan'l Boone tv series aired.