hello giltech,
you may simply process the data with tr options, and saving the file as csv format.
here’s an example,
//to convert spaces as a comma
$ cat tegrastats.txt | tr -s ' ' ',' > tmp.txt
//to convert "%@" as a comma
$ cat tmp.txt | tr -s "%@" ',' > output.csv
try opening output.csv to review the results, and you may add more process by your own.