Hi Al 🙂
No point rushing it if there isn't any need to!
I wouldn't see any issue in using those. My only suggestion would be with them being a matt white perhaps test grouting on an offcut that the grout doesn't stain especially if you are using a darker grout. A temporary sealer might be best with it being your first time grouting (just a guess) and the finish of the tiles might stain. I've been caught out on matt finish tiles before...
No point rushing it if there isn't any need to!
I wouldn't see any issue in using those. My only suggestion would be with them being a matt white perhaps test grouting on an offcut that the grout doesn't stain especially if you are using a darker grout. A temporary sealer might be best with it being your first time grouting (just a guess) and the finish of the tiles might stain. I've been caught out on matt finish tiles before...