filtering blastx output file

Question

[analyst]

This is the standalone blast output header. I have to apply filtration w.r.t query coverage. Kindly guide which of the following columns represent query coverage.

Thanks

qseqid sseqid pident length mismatch gapopen qstart qend sstart send evalue bitscore

[GenoMax]

Column descriptions found here: https://www.metagenomics.wiki/tools/blast/blastn-output-format-6

[analyst]

I have visited this site already but query coverage is not given with default command or I am not able to get. I have to filter transcripts with coverage of target >80%. For that which column should I select for filtration?

qseqid sseqid pident length mismatch gapopen qstart qend sstart send evalue bitscore

[analyst]

I have to remove transcripts with significant homology to known proteins (e.g., e-value <1e-10, coverage of target >80%, and identity >90%).

Should I use following command:

Note: Since I am not sure about coverage of target in the blastx output, I have written command below without adding that parameter temporarily.

awk '{ if ($3 <= 90 && $11 >= "1e-10") print $0}' blastx_output.txt > filtered.txt

the output contains evalue with 2e-n to onwards. Is it right or should I use $11 <= "1e-10"

[analyst]

Which filtering option should I use to get novel transcripts?