CBS and the American Theater Wing know a strike is likely and are not stupid, and likely are preparing for a ceremony/telecast that happens in the event of a strike. The first sign of that was going with Ariana DeBose as host over the seemingly predestined host with the move uptown of Lin Manuel Miranda. Miranda is a member of the WGA and hosting would put him in a predicament with the union in the event of a strike. DeBose on the other hand is only a SAG and Equity member, the former of which stated while they support the WGA, members should still go to work.
Second while I know some have pointed to the 2008 Golden Globes, the 2008 SAG awards went off without a hitch with WGA granting a waiver a month before the ceremony. I have to assume the American Theater Wing is in the middle of ironing out, but cannot announce it until the strike officially begins.
Third regarding the Golden Globes, in their statement at the time the WGA chose to picket the Globes because it was produced by Dick Clark Productions, a production company that was being struck at the time. The Tony Awards are produced by Tony Award Productions a joint venture between the American Theater Wing and The Broadway League, two entities that are not involved in the strike outside of the Tony Awards. Thus pointing to the likelihood of a waiver and agreement not to picket the event.
Fourth remember the WGA is not involved in Broadway, theater writers are represented by the Dramatists Guild. While some members may belong to both of are both WGA and DGA, and actors belong to both Equity and SAG, theater is a different industry that they only work on during the Tony Awards. Thus for the WGA not to agree to a waiver and in doing so severely hurt an industry just starting to recover from the pandemic, it would ruffle a lot of feather and could backfire significantly more than staying "Union Strong". As there are at least 4 productions Some Like It Hot, Kimberly Akimbo, Shucked, and Life of Pi whose entire runs are looking to be dependent on the Tony Awards and if they don't happen several hundreds of jobs will likely lost will be on the WGA's hands.
But back to the strike proofing though, the waiver does not mean that WGA workers can work on the Tonys. Tt only means that their will not be a picket line at the ceremony. It will still be up to Debose, to come up with her opening number/monologue, any bits performed during the show, and presenter banter themselves. As the Tony's are much more reliant on performances than bits and banter, I would just assume they extend the amount of time each production is given and the opening number to be a mash up over an original song.