When does "nextrun" field update from SQL table cron?

[EquinoxWorld]

Hello everyone, I was wondering if anyone knew when is the field "nextrun" in the SQL table cron updated? Here's my situation:

I have a SQL update query that I runs in a cron file that I setup to run every week. In that SQL query I need to specify the date of the next time this cron will run. If use the field "nextrun" from the table cron within this cron job will the date be the next already or the current one of that day still? Basically what I am asking is if the cron is being executed will the nextrun time be already updated for next run If I call that field from within the cron file and use it in a query? I know it's a bit confusing but If anyone has any info please let me know. Thank you for your time.

Regards.