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#155 Su-7BMK - variant with 96 rockets (6 hardpoints) was produced from 1969 and they could be probably delivered to Egypt not sooner, than in 1972 batch. According to a Polish article on Su-7, all Egyptian Su-7 were withdrawn by 1979 after getting worn.
#156 Su-7UM - it should be renamed Su-7BMK, and it could take 4 bombs 500 kg (without external tanks). Used from 4/67 until probably 1979 (see above). UM (correctly UMK) was a trainer variant with maximum bomb load 2x250 kg.
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The Su-7s seldom left the base without at least a couple of drop tanks, the ventral ones usually. While I have read of at least one mission when bombs were carried on all six hardpoints it was a very short range mission (few minutes of flight) on an high priority target (an israeli HQ in 1973) and the pilots had at least one eye permanently glued to the fuel gauge. A typical CAS combat load would be well short of the theoretical maximum.