welcome to the group.

my thought is if your not sure about going on this ride then go with what you have. unless you want to invest in some slick tires which are nice if you get a trainer.

i only have a mtb also, but we only have a small section of road paved, less than a 1/4 mile in front of the airport. i take my mtb over that with no problem. the tires i have on though aren't super grippy, but the old ones i had were and they seemed fine. its just a matter of how much extra you want to work or pay.