I can update to Virtuemart 3.8.8 with In Stora? Now I have Joomla 3.9.24, VM 3.8.6 and the last version of template, v1.02
The template will work fine for the latest Joomla but its not officially test for latest VM version. I suggest you to wait for the updates or you can do the update on test and let me know if there is any issue we fix it early for you.
There can be style changes for VM layouts as template use custom override for VM to give better look in template.