You can wait but the problem is that you will loose all your data once you relock in a few weeks / months as relocking will erase everything again.
So the best is to install and relock the soonest IF possible: as Piero said, if you cannot check the original Android Safety Patch Level because it was replaced by the one of the new (unlocked system), then send the two following commands in fastboot mode to check the state of your device:
check bootloader status by running :
./fastboot oem device-info
./fastboot flashing get_unlock_ability
if the return is
0
DON’T TRY TO RELOCK
risk is to brick your device (wait untill next /e/OS update)if the return is
1
→ you can relock
fastboot flashing lock_critical
fastboot flashing lock
SPL date of 3.3 is December 5th
Also an important improvement is that there should not be anymore a confusing 4-5 days difference between the original Android SPL date from fairephone and /e/OS SPL date, so the command line instructions stating that the /e/OS date must be same or more recent should now be correct in all cases.
We just miss now an auto-check of those dates or of the get_unlock_ability variable status by Web/easy-installer so that to end getting people stuck at relocking without a clue 
Its progressing !