Review

Small tiling job

We have two small gaps (approx. 10cm x 10cm each), in a tiled border which runs around the base of our bathroom walls. We need tiles cut & installed to fill the gaps / finish the border. We have large floor tiles available, which we're hoping can be cut and used to fill the small gaps (?). Grouting to match existing is required - we have a tube of grout, but not sure if it's the right product. Looking for a tidy finish to complete the edges around a recent shower installation.