Timestamp in Logfile SOLVED

I log results from toolset, offsets and probing. Occasionally need the initial value again.
The below m function makes a timestamp in the logfile, unfortunately always after the log entry.
If M100 is before LOGAPPEND or after (LOGCLOSE) makes no difference.
If someone has an idea, how to place the timestamp before the log entry.
Thanks

#!/bin/bash
file=/LOG_100.NGC
echo "* prob webcent: " "$(date "+%A %d.%B %Y %T") *" >> $file
echo "" >> $file
echo "*********************************************************************" >> $file

hi you may like it that way

.

Thanks there was not much input to this problem, so I realized this in a way, working better as desired.
The newest entry is at the top of the file, so don`t have to scroll for the new entrys.
LOG_TEST.NGC containing the LOGs. LOG1 and LOG2 are temporary and can be deleted.

UPDATED:

The LOG routine:

(LOGOPEN,/home/tesla/NcFiles/LOGs/.LOG1)
(LOG,)
(LOG,* WK_WEBCENT Y = 277.258 ** D_WEBCENT Y = 358.119 *)
(LOGCLOSE)
M66 E0 L0
M150 P100
M66 E0 L0


The to make executable M150:


#!/bin/bash
# .LOG1 und .LOG2 not visible
file=/home/tesla/NcFiles/LOGs/.LOG1
file=/home/tesla/NcFiles/LOGs/.LOG2
case $1 in
100.000000)
file=/home/tesla/NcFiles/LOGs/LOG_100.NGC
meas="* Stegmittelpunkt ermittelt am: "
;;
101.000000)
file=/home/tesla/NcFiles/LOGs/LOG_101.NGC
meas="* Bohrungsmittelpunkt ermittelt am: "
;;
102.000000)
file=/home/tesla/NcFiles/LOGs/LOG_102.NGC
meas="* Bohrungsdurchmesser ermittelt am: "
;;
esac
timestamp="$(date "+%A %d.%B %Y %T")"
cat $file > $file2
echo "$meas $timestamp *" > $file
cat $file1 >> $file
echo ";***********************************************************************" >> $file
cat $file2 >> $file
exit 0


Updated this post with recent changes, the extended version is running on my machine.
When implementing to my probing routines, some changes required. Now all process have their own LOG file.
Otherwise was a mess. The temporary LOG1 and LOG2 made not visible.
And the most important change, queue buster for solid results.