Calculating archivedlog file size per day

Hi:

I want to calculate archivedlog file size per day to estimate backup storage area for the database which is currently operating in NOARCHIVELOG MODE. My redo log filesize is 100MB and below is the query.

select trunc(FIRST_TIME),count(*)*100 size_in_MB from gv$loghist
group by trunc(FIRST_TIME);

If the database is in ARCHIVELOG mode, then I can use the below query to calculate the same (of course I can check file system)

select trunc(COMPLETION_TIME),count(*)*100 size_in_MB from gv$archived_log
group by trunc(COMPLETION_TIME);

Just wanted to verify.

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