Last minute predictions for the main categories (assuming they do get nominated,
blue is who I'm hoping will win,
red is who I think will):
Best Picture
1917
Jojo Rabbit
Joker
Little Women
Marriage Story
The Irishman
Once Upon a Time in Hollywood
Parasite
I wouldn't rule out 1917 or The Irishman (if the Academy can get over its hatred of Netflix, that is) winning, though. I can't believe that I'm the least confident about Little Women getting nominated, when it's one of the most deserving potential nominees 
Best Director
Bong Joon-ho (Parasite)
Martin Scorsese (
The Irishman)
Quentin Tarantino (
Once Upon a Time in Hollywood)
Sam Mendes (1917)
Todd Phillips (
Joker)
Todd Phillips getting nominated over Greta Gerwig would suck, especially when he'd be nominated in the same category as a director he flagrantly ripped off, but I can easily see it happening
Best Actor
Adam Driver (Marriage Story)
Leonardo DiCaprio (
Once Upon a Time in Hollywood)
Joaquin Phoenix (Joker) 
Robert De Niro (
The Irishman)
Taron Egerton (
Rocketman)
Best Actress
Awkwafina (The Farewell)
Charlize Theron (
Bombshell)
Renée Zellweger (Judy)
Saoirse Ronan (
Little Women)
Scarlett Johansson (
Marriage Story)
I could see Cynthia Erivo taking Awkwafina's token POC slot here though
Best Supporting Actor
Al Pacino (
The Irishman)
Brad Pitt (Once Upon a Time in Hollywood)
Jamie Foxx (
Just Mercy)
Joe Pesci (
The Irishman)
Song Kang-ho (Parasite)
Best Supporting Actress
Florence Pugh (Little Women)
Laura Dern (Marriage Story)
Jennifer Lopez (Hustlers)
Margot Robbie (
Bombshell)
Scarlett Johansson (
Jojo Rabbit)
yes I'm declaring that I want a tie, what of it (although in reality Florence could easily be replaced in this category by Nicole Kidman for Bombshell, so I'm not holding my breath)
Best Original Screenplay
1917
Knives Out
Marriage Story
Once Upon a Time in Hollywood
Parasite
Best Adapted Screenplay
A Beautiful Day in the Neighborhood
The Irishman
Jojo Rabbit
Joker
Little Women
Best International Film
Atlantics
Honeyland
Les Misérables
Pain and Glory
Parasite
Best Animated Feature
Frozen II
How to Train Your Dragon: The Hidden World
I Lost My Body
Missing Link
Toy Story 4