How to sum up a daily total, in parallel with another function in php?

Question

PHP

Good evening. Tell me how to implement, there is a script that performs the same type of task, with an interval (launched via cron). At the end of the day at 00:00 sums up and enters everything in the database for detailed statistics. But the problem is how to organize it so that it sums up at this time. It only came to my mind to write a separate script and create 1 more task in cron, but in my opinion this is not comme il faut. There was also an idea to shove it into the main script, and just constantly check the time, an error is also possible, because the main script can be executed at this time. So I think what other variations can there be, and are there any?