I'll put an article link here once I can find a very current one.
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Edit
This is the best link I could find.
Israel-Hamas war live updates: Gaza faces "full siege" as IDF says territory is back under control
As Israel reeled from the surprise attack, it ordered a "full siege" of Gaza and pounded the area with airstrikes. The IDF said it had gathered 300,000 troops ahead of what many expect to be a ground operation into the densely populated coastal enclave.
that's half the idf including reserves if true
doesn't leave much in reserve/to combat hezbollah
It's like 20% of the total population of Gaza. It's going to be a total shit show. Urban warfare at high densities generally doesn't go well for the attacker