J
J Sid
I would lay and then give a good clean and leave to completely dry for as long as possible 2,3 or 4 days depending on time of year and where the tiles how been stored, and then seal and grout. Clean again, let dry and seal a final time.
If on a site then make it clear that NOBODY walks anywhere near the floor till completed.
If on a site then make it clear that NOBODY walks anywhere near the floor till completed.