I've coded the invites into four groups:
Italic, Bold - locks to make the Opening Day roster, barring injury or trade
Red, Bold, plain text - Likely to make it
Red plain text - Bubble players
Black plain text - Little or no chance
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All told, there are 21 spots that seem 100% locked-up to me. On a standard modern NL roster, that's 10 of 12 pitchers, 6 of 6 infielders, 4 of 5 outfielders and 1 of 2 catchers - though the team looks poised to carry only four outfielders by adding Francisco. And it could possibly carry one less pitcher for the first week of the season or so.