The end of a fixed term lease does not necessarily mean the end of the tenancy. If the tenant wishes to stay and the landlord does not have a valid reason to terminate the tenancy then that means  the tenancy will continue on a month-to-month basis (on the same terms and conditions of the original tenancy agreement). However, if the tenant has given proper notice to terminate their tenancy or the landlord has given notice to terminate based on a valid ground then the landlord has the right to show the unit to prospective tenants.

Here is a link to our Fact Sheet on entering the property: https://landlordselfhelp.com/media/Entering-Unit.pdf.