Regarding Buses on Saturdays and Sundays Green Bus operate a semi fast Metro replacement bus stopping at Birmingham, Jewellery Quarter, The Hawthorns, West Bromwich, Black Lake, Wednesbury not sure if it is Parkway or Great Western, Bilston, Preistfeild and Wolverhampton Bus Station for Wolverhampton St Georges. For non weekends NXWM services 16,74,79 and 101. As I get the from Darlaston to Wolverhampton on Monday, Tuesday and Wednesday at around 7-9AM and then 3PM-5PM all of the buses I have caught have been rammed with me having to stand for half an hour on the 17:45PM from Wolverhampton it appears many passengers for the tram are getting the 79 all the way to West Bromwich then getting on the 74. If you live in Wednesbury You can get other buses to West Brom 40 via Friar Park and the 47 Via Hateley Heath. There is talks that NXWM might either temporarily extend the 79 back to Birmingham or run a 79A to Birmingham or are thinking of a Metro replacement that follows the Tram for Weekdays with normal support for Weekends when Green Bus operate it. I've also heard some of the new Trams they have might run a shuttle service in Birmingham and Wolverhampton but on Matchdays they might run it the whole line. There are also talks the old Trams that these replaced those that are in Storage might be used briefly. All that I know is the buses are going to be rammed and there is a blockade on the Brum to Wolves line at Tipton and some of those trains mostly WMR get cancelled. You can travel between Brum and Wolves with a Metro ticket on WMR, Aventi, CrossCountry and TFW. I do know that Avanti sometimes stop at Sandwell and Dudley then you can get NXWM 4,4H,4M,3,3A and Diamond 4 and 4H to West Brom from there. This metro work also means from what I have seen in Wolvo they are either relaying the Track or the casing for it saw it on Wednesday on the extension to the Train Station by St Georges.
