I had been in Minoritenkirche long ago, so I do not remember the opening times when there is no mass. Maybe these links will help you.
https://www.minoritenkirche.wien/minoritenkirche/menu-eng
https://fsspx.at/de
Zentralfriedhof opens at 7am. https://www.friedhoefewien.at/wiener-zentralfriedhof
There are two routes (of equal duration, approx. 30 minutes) to the cemetery.
(1) U3 (orange line) to Simmering (terminus), change to tram line 71 or 11 (direction Kaiserebersdorf), alight at Tor 2 (gate 2), which is the main entrance to the cemetery.
(2) At the Ring (Ring Boulevard) hop onto tram 71 (direction Kaiserebersdorf) an go directly to the cemetery (as given above).
I'd prefer route (2) just because you can see a lot of the city (instead going through a tunnel).
Make sure to visit the church at the cemetery. It is a marvelous example of Jugendstil (art deco) architecture, only outperformed by this church.
Before leaving the cemetery I recommend a stop in Oberlaa café where you can get the best cakes and pastries. (IMHO, better than at Demel, Sacher, etc.)
Your transit passes are valid throughout the whole State of Vienna, day and night, unlimited travel.
