I don’t know if it’s standard, but we tend to hold off on getting nitros ready until the person is there to get their mobile order so it doesn’t go bad. I would think you should be good if you order half way, especially if it’s possible to go in and grab your mobile order. I know at my store we start getting extra busy around 7am, but different days can be slightly different. For us Monday’s and Tuesday’s tend to be a little slower. To avoid stress it might not be a bad idea to order before you leave tomorrow and gauge what the lines are like at that time, if you can maybe even ask the barista what to do in the future. At worst, if you get there and it seems like your drink has been sitting out you can always ask to have it remade. Nitro with sweet cream is super easy so it’s not time intensive to remake if needed. Congrats on the new job!