As long as the proteins are frozen and were prepared in presence of proteases inhibitors and phosphatases inhibitors (if you want to verify the phosphorylation state) they will be ok.
The lysates must be aliquoted (to avoid freeze and thaw) and stored in in appropriate lysis buffer + protease and phosphotase inhibitor in -20 (for short term, immediate use) and in -80 (for long term use, upto years)